Header File 

math.h, stdlib.h 

Category 

Conversion Routines, Math Routines, 

Prototype 

char *_i64toa(__int64 value, char *string, int radix); 

wchar_t *_i64tow(__int64 value, wchar_t *string, int radix); 

Description 

_i64toa converts an __int64 to a string. _i64tow is the unicode version. It converts a __int64 to a wide-character string. 

These functions convert value to a null-terminated string and store the result in string. value is an __int64. 

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 (-).

Returns a pointer to string. 

Portability