30-1

#include<stdio.h>

// use line        f = fopen ("test.txt", "wb");      and open the file
// in notepad: no new lines! But if you open it in visual C's editor, you see
// new lines. (\n is really two characters: one goes to the next line but
// at the same location as the line above it, and another one goes to the
// beginning of the new line).
// Now change "wb" to "w" to write in ASCII instead of binary

void main ()
{
	char matn[1024];
	char str[80];
	int i;
	FILE *f;

	f = fopen ("test.txt", "w");
	if (!f) {
		printf("Cannot open test.txt for writing.\n");
		return;
	}

	fprintf(f, "line 1\nthis is line 2\nand line 3\n");
	fclose(f);
}