Ex1

#include <stdio.h>
#include <stdlib.h>

int main() {
	char a, b;
	unsigned cnt = 1;
	FILE *f, *g;
	f = fopen("in.txt", "r");
	g = fopen("out.txt", "w");
	fscanf(f, "%c", &a);
	while (!feof(f)) {
		fscanf(f, "%c", &b);
		if (a == b) cnt++;
		else{
			fprintf(g, "%c%u", a, cnt);
			a = b;
			cnt = 1;
		}
	}
	fclose(f);
	fclose(g);
	return 0;
}