Convert an Integer into a String in c++

Convert an Integer into a String  in c++

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;
  system("pause");
  return 0;
} 

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string to numeric

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);

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);

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