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How To install MinGW on Windows 10 (GCC & G++)

December 6, 2016 admin 0

MinGW, a contraction of “Minimalist GNU for Windows”, is a minimalist development environment for native Microsoft Windows applications. Downloading MinGW open […]

Qt Tutorials For Beginners – Simple Notepad Application

December 1, 2016 admin 0

qt notepad design QtNotepadDemo.pro

#-------------------------------------------------
#
# Project created by QtCreator 2016-05-26T17:28:11
#
#-------------------------------------------------

QT       += core gui printsupport

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = QtNotepadDemo
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

RESOURCES += \
    resource.qrc

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#-------------------------------------------------

#

# Project created by QtCreator 2016-05-26T17:28:11

#

#-------------------------------------------------

QT += core gui printsupport

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = QtNotepadDemo

TEMPLATE = app

SOURCES += main.cpp\

mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

RESOURCES += \

resource.qrc

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_actionNew_triggered();

    void on_actionCopy_triggered();

    void on_actionOpen_triggered();

    void on_actionSave_triggered();

    void on_actionSave_as_triggered();

    void on_actionCut_triggered();

    void on_actionPaste_triggered();

    void on_actionRedo_triggered();

    void on_actionUndo_triggered();

    void on_actionAbout_Notepad_triggered();

    void on_actionFont_triggered();

    void on_actionColor_triggered();

    void on_actionBackground_Color_triggered();

    void on_actionBackgroung_Color_Edit_Text_triggered();

    void on_actionPrint_triggered();

private:
    Ui::MainWindow *ui;
    QString file_path_;
};

#endif // MAINWINDOW_H

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#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

~MainWindow();

private slots:

void on_actionNew_triggered();

void on_actionCopy_triggered();

void on_actionOpen_triggered();

void on_actionSave_triggered();

void on_actionSave_as_triggered();

void on_actionCut_triggered();

void on_actionPaste_triggered();

void on_actionRedo_triggered();

void on_actionUndo_triggered();

void on_actionAbout_Notepad_triggered();

void on_actionFont_triggered();

void on_actionColor_triggered();

void on_actionBackground_Color_triggered();

void on_actionBackgroung_Color_Edit_Text_triggered();

void on_actionPrint_triggered();

private:

Ui::MainWindow *ui;

QString file_path_;

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <QFileDialog>
#include <QTextStream>
#include <QMessageBox>
#include <QFontDialog>
#include <QFont>
#include <QColorDialog>
#include <QColor>
#include <QPrinter>
#include <QPrintDialog>
MainWindow::MainWindow(QWidget *parent) :
  QMainWindow(parent),
  ui(new Ui::MainWindow)
{
  ui->setupUi(this);
  this->setCentralWidget(ui->textEdit);
}

MainWindow::~MainWindow()
{
  delete ui;
}

void MainWindow::on_actionNew_triggered()
{
  file_path_ = "";
  ui->textEdit->setText("");
}

void MainWindow::on_actionCopy_triggered()
{
  ui->textEdit->copy();
}

void MainWindow::on_actionOpen_triggered()
{
  QString file_name = QFileDialog::getOpenFileName(this,"Open the file");
  QFile file(file_name);
  file_path_ = file_name;
  if(!file.open(QFile::ReadOnly | QFile::Text)) {
      QMessageBox::warning(this,"..","file not open");
      return;
    }
  QTextStream in(&file);
  QString text = in.readAll();
  ui->textEdit->setText(text);
  file.close();
}

void MainWindow::on_actionSave_triggered()
{

  QFile file(file_path_);
  if(!file.open(QFile::WriteOnly | QFile::Text)) {
      QMessageBox::warning(this,"..","file not open");
      return;
    }
  QTextStream out(&file);
  QString text = ui->textEdit->toPlainText();
  out << text;
  file.flush();
  file.close();
}

void MainWindow::on_actionSave_as_triggered()
{
  QString file_name = QFileDialog::getSaveFileName(this,"Open the file");
  QFile file(file_name);
  file_path_ = file_name;
  if(!file.open(QFile::WriteOnly | QFile::Text)) {
      QMessageBox::warning(this,"..","file not open");
      return;
    }
  QTextStream out(&file);
  QString text = ui->textEdit->toPlainText();
  out << text;
  file.flush();
  file.close();
}

void MainWindow::on_actionCut_triggered()
{
  ui->textEdit->cut();
}

void MainWindow::on_actionPaste_triggered()
{
  ui->textEdit->paste();
}

void MainWindow::on_actionRedo_triggered()
{
  ui->textEdit->redo();
}

void MainWindow::on_actionUndo_triggered()
{
  ui->textEdit->undo();
}

void MainWindow::on_actionAbout_Notepad_triggered()
{
  QString about_text;
  about_text  = "Auther : somebody\n";
  about_text += "Date   : 12/05/2016\n";
  about_text += "(C) Notepad  (R)\n";

  QMessageBox::about(this,"About Notepad",about_text);
}

void MainWindow::on_actionFont_triggered()
{
  bool ok;
  QFont font = QFontDialog::getFont(&ok, this);
  if (ok) {
      ui->textEdit->setFont(font);
    } else return;

}

void MainWindow::on_actionColor_triggered()
{
  QColor color = QColorDialog::getColor(Qt::white,this,"Choose Color");
  if(color.isValid()) {
      ui->textEdit->setTextColor(color);
    }
}

void MainWindow::on_actionBackground_Color_triggered()
{
  QColor color = QColorDialog::getColor(Qt::white,this,"Choose Color");
  if(color.isValid()) {
      ui->textEdit->setTextBackgroundColor(color);
    }
}

void MainWindow::on_actionBackgroung_Color_Edit_Text_triggered()
{
  QColor color = QColorDialog::getColor(Qt::white,this,"Choose Color");
  if(color.isValid()) {
      ui->textEdit->setPalette(QPalette(color));
    }
}

void MainWindow::on_actionPrint_triggered()
{
  QPrinter printer;
  printer.setPrinterName("desierd printer name");
  QPrintDialog dialog(&printer,this);
  if(dialog.exec() == QDialog::Rejected) return;
  ui->textEdit->print(&printer);
}

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#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QFile>

#include <QFileDialog>

#include <QTextStream>

#include <QMessageBox>

#include <QFontDialog>

#include <QFont>

#include <QColorDialog>

#include <QColor>

#include <QPrinter>

#include <QPrintDialog>

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

ui(new Ui::MainWindow)

{

ui->setupUi(this);

this->setCentralWidget(ui->textEdit);

}

MainWindow::~MainWindow()

{

delete ui;

}

void MainWindow::on_actionNew_triggered()

{

file_path_ = "";

ui->textEdit->setText("");

}

void MainWindow::on_actionCopy_triggered()

{

ui->textEdit->copy();

}

void MainWindow::on_actionOpen_triggered()

{

QString file_name = QFileDialog::getOpenFileName(this,"Open the file");

QFile file(file_name);

file_path_ = file_name;

if(!file.open(QFile::ReadOnly | QFile::Text)) {

QMessageBox::warning(this,"..","file not open");

return;

}

QTextStream in(&file);

QString text = in.readAll();

ui->textEdit->setText(text);

file.close();

}

void MainWindow::on_actionSave_triggered()

{

QFile file(file_path_);

if(!file.open(QFile::WriteOnly | QFile::Text)) {

QMessageBox::warning(this,"..","file not open");

return;

}

QTextStream out(&file);

QString text = ui->textEdit->toPlainText();

out << text;

file.flush();

file.close();

}

void MainWindow::on_actionSave_as_triggered()

{

QString file_name = QFileDialog::getSaveFileName(this,"Open the file");

QFile file(file_name);

file_path_ = file_name;

if(!file.open(QFile::WriteOnly | QFile::Text)) {

QMessageBox::warning(this,"..","file not open");

return;

}

QTextStream out(&file);

QString text = ui->textEdit->toPlainText();

out << text;

file.flush();

file.close();

}

void MainWindow::on_actionCut_triggered()

{

ui->textEdit->cut();

}

void MainWindow::on_actionPaste_triggered()

{

ui->textEdit->paste();

}

void MainWindow::on_actionRedo_triggered()

{

ui->textEdit->redo();

}

void MainWindow::on_actionUndo_triggered()

{

ui->textEdit->undo();

}

void MainWindow::on_actionAbout_Notepad_triggered()

{

QString about_text;

about_text = "Auther : somebody\n";

about_text += "Date : 12/05/2016\n";

about_text += "(C) Notepad (R)\n";

QMessageBox::about(this,"About Notepad",about_text);

}

void MainWindow::on_actionFont_triggered()

{

bool ok;

QFont font = QFontDialog::getFont(&ok, this);

if (ok) {

ui->textEdit->setFont(font);

} else return;

}

void MainWindow::on_actionColor_triggered()

{

QColor color = QColorDialog::getColor(Qt::white,this,"Choose Color");

if(color.isValid()) {

ui->textEdit->setTextColor(color);

}

void MainWindow::on_actionBackground_Color_triggered()

{

QColor color = QColorDialog::getColor(Qt::white,this,"Choose Color");

if(color.isValid()) {

ui->textEdit->setTextBackgroundColor(color);

}

void MainWindow::on_actionBackgroung_Color_Edit_Text_triggered()

{

QColor color = QColorDialog::getColor(Qt::white,this,"Choose Color");

if(color.isValid()) {

ui->textEdit->setPalette(QPalette(color));

}

void MainWindow::on_actionPrint_triggered()

{

QPrinter printer;

printer.setPrinterName("desierd printer name");

QPrintDialog dialog(&printer,this);

if(dialog.exec() == QDialog::Rejected) return;

ui->textEdit->print(&printer);

}

main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  MainWindow w;
  w.show();

  return a.exec();
}

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#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

MainWindow w;

w.show();

return a.exec();

}

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>513</width>
    <height>361</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <layout class="QHBoxLayout" name="horizontalLayout">
    <item>
     <widget class="QTextEdit" name="textEdit"/>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menuBar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>513</width>
     <height>21</height>
    </rect>
   </property>
   <widget class="QMenu" name="menuFile">
    <property name="title">
     <string>File</string>
    </property>
    <addaction name="actionNew"/>
    <addaction name="actionOpen"/>
    <addaction name="separator"/>
    <addaction name="actionSave"/>
    <addaction name="actionSave_as"/>
    <addaction name="separator"/>
    <addaction name="actionPrint"/>
   </widget>
   <widget class="QMenu" name="menuEdit">
    <property name="title">
     <string>Edit</string>
    </property>
    <addaction name="actionCut"/>
    <addaction name="actionCopy"/>
    <addaction name="actionPaste"/>
    <addaction name="separator"/>
    <addaction name="actionRedo"/>
    <addaction name="actionUndo"/>
    <addaction name="separator"/>
    <addaction name="actionFont"/>
    <addaction name="actionColor"/>
    <addaction name="actionBackground_Color"/>
    <addaction name="actionBackgroung_Color_Edit_Text"/>
   </widget>
   <widget class="QMenu" name="menuAbout">
    <property name="title">
     <string>about</string>
    </property>
    <addaction name="actionAbout_Notepad"/>
   </widget>
   <addaction name="menuFile"/>
   <addaction name="menuEdit"/>
   <addaction name="menuAbout"/>
  </widget>
  <widget class="QToolBar" name="mainToolBar">
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
   <addaction name="actionNew"/>
   <addaction name="actionOpen"/>
   <addaction name="actionSave"/>
   <addaction name="actionSave_as"/>
   <addaction name="separator"/>
   <addaction name="actionCut"/>
   <addaction name="actionCopy"/>
   <addaction name="actionPaste"/>
   <addaction name="separator"/>
   <addaction name="actionRedo"/>
   <addaction name="actionUndo"/>
   <addaction name="separator"/>
   <addaction name="actionAbout_Notepad"/>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
  <action name="actionNew">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/new.png</normaloff>:/rec/img/new.png</iconset>
   </property>
   <property name="text">
    <string>New</string>
   </property>
  </action>
  <action name="actionOpen">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/open.png</normaloff>:/rec/img/open.png</iconset>
   </property>
   <property name="text">
    <string>Open</string>
   </property>
  </action>
  <action name="actionSave">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/save.png</normaloff>:/rec/img/save.png</iconset>
   </property>
   <property name="text">
    <string>Save</string>
   </property>
  </action>
  <action name="actionSave_as">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/save-as.png</normaloff>:/rec/img/save-as.png</iconset>
   </property>
   <property name="text">
    <string>Save as</string>
   </property>
  </action>
  <action name="actionCut">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/cut.png</normaloff>:/rec/img/cut.png</iconset>
   </property>
   <property name="text">
    <string>Cut</string>
   </property>
  </action>
  <action name="actionCopy">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/copy.png</normaloff>:/rec/img/copy.png</iconset>
   </property>
   <property name="text">
    <string>Copy</string>
   </property>
  </action>
  <action name="actionPaste">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/paste.png</normaloff>:/rec/img/paste.png</iconset>
   </property>
   <property name="text">
    <string>Paste</string>
   </property>
  </action>
  <action name="actionRedo">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/redo.png</normaloff>:/rec/img/redo.png</iconset>
   </property>
   <property name="text">
    <string>Redo</string>
   </property>
  </action>
  <action name="actionUndo">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/undo.png</normaloff>:/rec/img/undo.png</iconset>
   </property>
   <property name="text">
    <string>Undo</string>
   </property>
  </action>
  <action name="actionAbout_Notepad">
   <property name="icon">
    <iconset resource="resource.qrc">
     <normaloff>:/rec/img/about.png</normaloff>:/rec/img/about.png</iconset>
   </property>
   <property name="text">
    <string>About Notepad</string>
   </property>
  </action>
  <action name="actionFont">
   <property name="text">
    <string>Font</string>
   </property>
  </action>
  <action name="actionColor">
   <property name="text">
    <string>Color</string>
   </property>
  </action>
  <action name="actionBackground_Color">
   <property name="text">
    <string>Background Color</string>
   </property>
  </action>
  <action name="actionBackgroung_Color_Edit_Text">
   <property name="text">
    <string>Backgroung Color Edit Text</string>
   </property>
  </action>
  <action name="actionPrint">
   <property name="text">
    <string>Print</string>
   </property>
  </action>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources>
  <include location="resource.qrc"/>
 </resources>
 <connections/>
</ui>

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<?xml version="1.0" encoding="UTF-8"?>

<class>MainWindow</class>

<rect>

</rect>

</property>

<string>MainWindow</string>

</property>

<item>

</item>

</layout>

</widget>

<rect>

</rect>

</property>

</property>

</widget>

</property>

</widget>

<string>about</string>

</property>

</widget>

</widget>

<enum>TopToolBarArea</enum>

</attribute>

<bool>false</bool>

</attribute>

</widget>

</property>

</property>

</action>

</property>

</property>

</action>

</property>

</property>

</action>

</property>

</property>

</action>

</property>

</property>

</action>

</property>

</property>

</action>

<normaloff>:/rec/img/paste.png</normaloff>:/rec/img/paste.png</iconset>

</property>

<string>Paste</string>

</property>

</action>

</property>

</property>

</action>

</property>

</property>

</action>

<normaloff>:/rec/img/about.png</normaloff>:/rec/img/about.png</iconset>

</property>

<string>About Notepad</string>

</property>

</action>

</property>

</action>

<string>Color</string>

</property>

</action>

<string>Background Color</string>

</property>

</action>

<string>Backgroung Color Edit Text</string>

</property>

</action>

<string>Print</string>

</property>

</action>

</widget>

</resources>

</ui>

resource.qrc

<RCC>
    <qresource prefix="/rec">
        <file>img/about.png</file>
        <file>img/copy.png</file>
        <file>img/cut.png</file>
        <file>img/new.png</file>
        <file>img/open.png</file>
        <file>img/paste.png</file>
        <file>img/redo.png</file>
        <file>img/save.png</file>
        <file>img/save-as.png</file>
        <file>img/undo.png</file>
    </qresource>
</RCC>

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<RCC>

<file>img/about.png</file>

<file>img/paste.png</file>

</qresource>

</RCC>

output

C++ Program to Convert Integer to String

December 1, 2016 admin 0

C++ Program to Convert Integer into a String

using namespace std;
#include <string>
#include <sstream>
#include <iostream>
template <class T>
std::string to_string(T t, std::ios_base & (*f)(std::ios_base&))
{
    std::ostringstream oss;
    oss << f << t;
                return oss.str();
}
int main()
{
                // the second parameter of to_string() should be one of
                // std::hex, std::dec or std::oct
    std::cout<<to_string<long>(123456, std::hex)<<std::endl;
    std::cout<<to_string<long>(123456, std::oct)<<std::endl;
                return 0;
}
/*
OUTPUT:
1e240
361100
*/

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using namespace std;

#include <string>

#include <sstream>

#include <iostream>

template <class T>

std::string to_string(T t, std::ios_base & (*f)(std::ios_base&))

{

std::ostringstream oss;

oss << f << t;

return oss.str();

}

int main()

{

// the second parameter of to_string() should be one of

// std::hex, std::dec or std::oct

std::cout<<to_string<long>(123456, std::hex)<<std::endl;

std::cout<<to_string<long>(123456, std::oct)<<std::endl;

return 0;

}

/*

OUTPUT:

1e240

361100

*/

C++ Function To Convert String To Numeric Integer

float              stof(const string& str, size_t *idx = 0);
double             stod(const string& str, size_t *idx = 0);
long double        stold(const string& str, size_t *idx = 0);
int                stoi(const string& str, size_t *idx = 0, int base = 10);
long               stol(const string& str, size_t *idx = 0, int base = 10);
unsigned long      stoul(const string& str, size_t *idx = 0, int base = 10);
long long          stoll(const string& str, size_t *idx = 0, int base = 10);
unsigned long long stoull(const string& str, size_t *idx = 0, int base = 10);

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float stof(const string& str, size_t *idx = 0);

double stod(const string& str, size_t *idx = 0);

long double stold(const string& str, size_t *idx = 0);

int stoi(const string& str, size_t *idx = 0, int base = 10);

long stol(const string& str, size_t *idx = 0, int base = 10);

unsigned long stoul(const string& str, size_t *idx = 0, int base = 10);

long long stoll(const string& str, size_t *idx = 0, int base = 10);

unsigned long long stoull(const string& str, size_t *idx = 0, int base = 10);

C++ Function […]

C++ Program to convert hexadecimal to decimal

November 28, 2016 admin 1

C++ Program to convert hexadecimal to decimal with std::hex

/**
 * Converting Hexadecimal to Decimal in C++  codebind.com
 *
 */

#include <iostream>
int main()
{
  int integer;
  std::cout<<"Entex Hex to Convert hex to decimal"<<std::endl;
  std::cin >> std::hex >> integer;
  std::cout << integer << std::endl;
  return 0;
}


/*
OUTPUT:
Entex Hex to Convert hex to decimal
10
16
*/

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/**

* Converting Hexadecimal to Decimal in C++ codebind.com

*

*/

#include <iostream>

int main()

{

int integer;

std::cout<<"Entex Hex to Convert hex to decimal"<<std::endl;

std::cin >> std::hex >> integer;

std::cout << integer << std::endl;

return 0;

}

/*

OUTPUT:

Entex Hex to Convert hex to decimal

10

16

*/

C++ Program to convert hexadecimal to decimal without std::hex

/**
 * Converting Hexadecimal to Decimal in C++  codebind.com
 *
 */


#include<iostream>
#include<stdlib.h>
#include<conio.h>
#include<math.h>


unsigned long HexToDec(char hex[]) {
  char *hexstr;
  int length = 0;
  const int base = 16;     // Base of Hexadecimal Number
  unsigned long decnum = 0;
  int i;

  // Now Find the length of Hexadecimal Number
  for (hexstr = hex; *hexstr != '\0'; hexstr++) {
      length++;
    }

  // Now Find Hexadecimal Number
  hexstr = hex;
  for (i = 0; *hexstr != '\0' && i < length; i++, hexstr++) {
      // Compare *hexstr with ASCII values
      if (*hexstr >= 48 && *hexstr <= 57) {  // is *hexstr Between 0-9
          decnum += (((int)(*hexstr)) - 48) * pow(base, length - i - 1);
        }
      else if ((*hexstr >= 65 && *hexstr <= 70))  {  // is *hexstr Between A-F
          decnum += (((int)(*hexstr)) - 55) * pow(base, length - i - 1);
        }
      else if (*hexstr >= 97 && *hexstr <= 102) {  // is *hexstr Between a-f
          decnum += (((int)(*hexstr)) - 87) * pow(base, length - i - 1);
        }
      else {
          std::cout<<"Invalid Hexadecimal Number \n";

        }
    }
  return decnum;
}

void main() {
  unsigned long decnum;
  char hex[9];     // 8 characters for 32-bit Hexadecimal Number and one for ' '

  std::cout<<" Enter 32-bit Hexadecimal Number : ";
  std::cin>>hex;

  decnum = HexToDec(hex);
  std::cout<<"Value in Decimal Number is "<<decnum<<"\n";

  getch();
}


/*
OUTPUT:
Enter 32-bit Hexadecimal Number : 10
Value in Decimal Number is 16

*/

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/**

* Converting Hexadecimal to Decimal in C++ codebind.com

*

*/

#include<iostream>

#include<stdlib.h>

#include<conio.h>

#include<math.h>

unsigned long HexToDec(char hex[]) {

char *hexstr;

int length = 0;

const int base = 16; // Base of Hexadecimal Number

unsigned long decnum = 0;

int i;

// Now Find the length of Hexadecimal Number

for (hexstr = hex; *hexstr != '\0'; hexstr++) {

length++;

}

// Now Find Hexadecimal Number

hexstr = hex;

for (i = 0; *hexstr != '\0' && i < length; i++, hexstr++) {

// Compare *hexstr with ASCII values

if (*hexstr >= 48 && *hexstr <= 57) { // is *hexstr Between 0-9

decnum += (((int)(*hexstr)) - 48) * pow(base, length - i - 1);

}

else if ((*hexstr >= 65 && *hexstr <= 70)) { // is *hexstr Between A-F

decnum += (((int)(*hexstr)) - 55) * pow(base, length - i - 1);

}

else if (*hexstr >= 97 && *hexstr <= 102) { // is *hexstr Between a-f

decnum += (((int)(*hexstr)) - 87) * pow(base, length - i - 1);

}

else {

std::cout<<"Invalid Hexadecimal Number \n";

}

return decnum;

}

void main() {

unsigned long decnum;

char hex[9]; // 8 characters for 32-bit Hexadecimal Number and one for ' '

std::cout<<" Enter 32-bit Hexadecimal Number : ";

std::cin>>hex;

decnum = HexToDec(hex);

std::cout<<"Value in Decimal Number is "<<decnum<<"\n";

getch();

}

/*

OUTPUT:

Enter 32-bit Hexadecimal Number : 10

Value in Decimal Number is 16

*/

[…]

C++ program to Convert Binary To Decimal

November 27, 2016 admin 0

/**
 * CONVERTING BINARY TO DECIMAL IN C++ codebind.com
 *
 */

#include <iostream>
#include <iomanip>
#include <string>
#include <climits>

using namespace std;

const size_t maxBits = sizeof(short) * CHAR_BIT;

int main(int argc, char *argv[]) {
  string line;
  bool inputOk;
  short n;

  while (true) {
      cout << "Enter binary number (" << maxBits;
      cout << " bits or less) : " << endl;
      do {
          cout << "> ";
          getline(cin,line);
          inputOk = true;
          for (size_t i = 0; (i < line.size()) && (inputOk == true); i++) {
              if ((line[i] != '0') && (line[i] != '1')) {
                  inputOk = false;
                  cout << "non-bit entered" << endl;
                }
            }
          if ((inputOk == true) && (line.size() > maxBits)) {
              inputOk = false;
              cout << "too big for " << maxBits << "-bit integer" << endl;
            }
        } while (inputOk == false);

      // Convert string of bits to an integer
      n = 0;
      for (int i = line.size()-1, j = 0; i >= 0; --i,j++) {
          n |= (line[i] - '0') << j;
        }
      cout << line << " = " << n << endl;
    }
  return 0;
}

/*
OUTPUT:
Enter binary number (16 bits or less) :
> 101000
101000 = 40
Enter binary number (16 bits or less) :
> 10
10 = 2
Enter binary number (16 bits or less) :
> 10
10 = 2
Enter binary number (16 bits or less) :
> 101
101 = 5
Enter binary number (16 bits or less) :
>

*/

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/**

* CONVERTING BINARY TO DECIMAL IN C++ codebind.com

*

*/

#include <iostream>

#include <iomanip>

#include <string>

#include <climits>

using namespace std;

const size_t maxBits = sizeof(short) * CHAR_BIT;

int main(int argc, char *argv[]) {

string line;

bool inputOk;

short n;

while (true) {

cout << "Enter binary number (" << maxBits;

cout << " bits or less) : " << endl;

do {

cout << "> ";

getline(cin,line);

inputOk = true;

for (size_t i = 0; (i < line.size()) && (inputOk == true); i++) {

if ((line[i] != '0') && (line[i] != '1')) {

inputOk = false;

cout << "non-bit entered" << endl;

}

if ((inputOk == true) && (line.size() > maxBits)) {

inputOk = false;

cout << "too big for " << maxBits << "-bit integer" << endl;

}

} while (inputOk == false);

// Convert string of bits to an integer

n = 0;

for (int i = line.size()-1, j = 0; i >= 0; --i,j++) {

n |= (line[i] - '0') << j;

}

cout << line << " = " << n << endl;

}

return 0;

}

/*

OUTPUT: