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
*/

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);

C++ Function To Convert Numeric Integer To String

NUMERIC TO STRING
string to_string(int val);
string to_string(unsigned val);
string to_string(long val);
string to_string(unsigned long val);
string to_string(long long val);
string to_string(unsigned long long val);
string to_string(float val);
string to_string(double val);
string to_string(long double val);