C++

Reference

<string>

function
<string>

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 valprintf equivalentdescription
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

1
2
3
4
5
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7
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12
 
// 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;
}

Possible output:
pi is 3.141593
28 is a perfect number


Exceptions

The string constructor may throw.

See also

sprintf
Write formatted data to string (function)
to_wstring
Convert numerical value to wide string (function)