C语言itoa()函数

#include <string.h>

int itoa(int num, char *dest){
if(dest == NULL)
return -1;

char temp[24];
temp[23] = '\0';
char *p = &temp[22];
while(num/10 != 0){
*(p--) = num%10 + 48;
num = num /10;
}
*p = num%10 + 48;
strcpy(dest, p);
return 0;
}