4 int main(int argc, char *argv[]) {
6 /* This is a comment in C */
8 printf("This is a C program\n");
9 FILE *f = fopen("hello.txt", "w");
11 printf("Error opening file!\n");
16 printf("Hello %s !\n", argv[1]);
17 fprintf(f, "Hello %s !\n", argv[1]);
19 printf("Hello world !\n");
20 fprintf(f, "Hello world !\n");
25 printf("This is the end of my C program\n");