30-3

#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

struct Daneshjoo {
	int shomareD;
	char esm[80];
	double nomre[20];
};

void main ()
{
	char matn[1024];
	char str[80];
	int i=23456;
	double A[200];
	FILE *f;
	struct Daneshjoo daneshjoohaa[100];

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

	fprintf(f, "Salam sosis!");
	fwrite(A, sizeof(A[0]), 200, f);
	fwrite(&daneshjoohaa[4], sizeof(struct Daneshjoo), 1, f);
	fwrite(&daneshjoohaa[0], sizeof(struct Daneshjoo), 100, f);

	fprintf(f, "Salam kalbas!");
	//while (!feof(f)) {
	//	fscanf(f, "%d", &i);
	//	printf("%d\n", i);
	//}
	fclose(f);
}