# C++ program to Convert Binary To Decimal

```/**
* 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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