function

std::to_string

string to_string (int val);
string to_string (long val);
string to_string (long long val);
string to_string (unsigned val);
string to_string (unsigned 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);

Convert numerical value to string

Returns a string with the representation of val.

The format used is the same that printf would print for the corresponding type:

type of val	`printf` equivalent	description
`int`	`"%d"`	Decimal-base representation of val. The representations of negative values are preceded with a minus sign (`-`).
`long`	`"%ld`
`long long`	`"%lld`
`unsigned`	`"%u"`	Decimal-base representation of val.
`unsigned long`	`"%lu`
`unsigned long long`	`"%llu`
`float`	`"%f"`	As many digits are written as needed to represent the integral part, followed by the decimal-point character and six decimal digits. `inf` (or `infinity`) is used to represent infinity. `nan` (followed by an optional sequence of characters) to represent NaNs (Not-a-Number). The representations of negative values are preceded with a minus sign (`-`).
`double`	`"%f`
`long double`	`"%Lf`

Parameters

val: Numerical value.

Return Value

A string object containing the representation of val as a sequence of characters.

Example

// to_string example
#include <iostream>   // std::cout
#include <string>     // std::string, std::to_string

int main ()
{
  std::string pi = "pi is " + std::to_string(3.1415926);
  std::string perfect = std::to_string(1+2+4+7+14) + " is a perfect number";
  std::cout << pi << '\n';
  std::cout << perfect << '\n';
  return 0;
}