Header File 

stdlib.h  

Category 

Conversion Routines, Math Routines 

Prototype 

char *itoa(int value, char *string, int radix); 

wchar_t *_itow(int value, wchar_t *string, int radix); 

Description 

Converts an integer to a string. 

itoa converts value to a null-terminated string and stores the result in string. With itoa, value is an integer. _itow is the unicode version of the function. It converts an integer to a wide-character string. 

radix specifies the base to be used in converting value; it must be between 2 and 36, inclusive. If value is negative and radix is 10, the first character of string is the minus sign (-).

itoa returns a pointer to string. 

Example  

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
   int number = 12345;
   char string[25];
   itoa(number, string, 10);
   printf("integer = %d string = %s\n", number, string);
   return 0;
}

Portability