#include <stdio.h>
int main(void){
FILE *fp;
fp = fopen("test.txt", "w");
if (fp == NULL){
printf("Can't open file!\n");
return -1;
}
printf("Open file succeed!\n");
printf("Write file start.\n");
fprintf(fp, "Write file by fprintf.\n");
printf("Write file end.\n");
fclose(fp);
return 0;
}