SDA 1.3

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

int main()
{
    FILE* f, *g;
    char a, b;
    int numar, i, count = 1;

    if (fopen_s(&f, "in.txt", "rt") != 0) {
        printf("Fiser negasit");
        return 0;
    }
    if (fopen_s(&g, "out.txt", "wt") != 0) {
        printf("Fiser negasit");
        return 0;
    }
    fscanf_s(f, "%c", &a);
    while (fscanf_s(f, "%c", &b) != EOF) {
        if (a == b) {
            count++;
        }
        else {
            fprintf_s(g, "%c%d", a, count);
            count = 1;
            a = b;
        }
    }
    fclose(f);
    return 0;
}