write error message to a file

#include <stdio.h>#include <string.h>int main(){ int i; FILE *fp; fp = fopen("strerror.txt", "w"); for (i = 0; i < 43; i++) { fprintf(fp, "strerror[%d] = /"%s/";/n", i, strerror(i)); } close(fp); getchar(); return 0;}