the usage(head file and other) of sprintf(), fprintf()

sprintf() is for string, while fprintf() is for file.

#include <stdio.h>

int main(void)

{

int a = -100;

FILE *fp;

unsigned char str[10];

sprintf(str, "%d", a); // str is string ptr.

printf("str: %s\n", str);

fp = fopen("/tmp/fprintf.txt", "w+");

fprintf(fp, "%s\n", str); // fp is a file ptr.

fclose(fp);

}