### 2.19 `itoa`—integer to string

Synopsis

    #include <stdlib.h>
    char *itoa(int value, char *str, int base);
    char *__itoa(int value, char *str, int base);

Description
`itoa` converts the integer value to a null-terminated string using the specified base, which must be between 2 and 36, inclusive. If base is 10, value is treated as signed and the string will be prefixed with ’-’ if negative. For all other bases, value is treated as unsigned. str should be an array long enough to contain the converted value, which in the worst case is sizeof(int)*8+1 bytes.

Returns
A pointer to the string, str, or NULL if base is invalid.

Portability
`itoa` is non-ANSI.

No supporting OS subroutine calls are required.