Header File 

stdlib.h 

Category 

Conversion Routines, Math Routines 

Prototype 

char *_ui64toa(unsigned __int64 value, char *string, int radix); 

wchar_t *_ui64tow(unsigned __int64 value, wchar_t *string, int radix); 

Description 

_ui64toa converts an unsigned __int64 to a string. 

_ui64tow is the unicode version. _ui64tow converts an unsigned __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