#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <math.h>
#define N 4

int main ()
{
    FILE *F1;
    FILE *F2;
    int matr[N][N], a, b, s1 = 0, s2 = 0;

    F1 = fopen("F1.txt", "w");
    for(int i = 0; i < N; i++)
    {
        for(int j = 0; j < N; j++)
        {
            matr[i][j] = rand() % 20 + (-10);
            printf("%4d", matr[i][j]);
            fprintf(F1, "%d ", matr[i][j]);
        }
        printf("\n");
        fprintf(F1, "\n");
    }
    fclose(F1);

    F1 = fopen("F1.txt", "r");
    for(int i = 0; i < N; i++)
    {
        for(int j = 0; j < N; j++)
            fscanf (F1, "%d", &matr[i][j]);
    }
    fclose(F1);

    F2 = fopen("F2.txt", "w");
    for(int i = 0; i < N; i++)
    {
        for(a = 0; a < i; a++)
        {
            if(matr[i][a] > 0)
                s1 += matr[i][a];
        }
    }
    fprintf(F2, "Suma > 0 pid: %d\n", s1);
    printf("Suma > 0 pid: %d\n", s1);

    for(int j = 0; j < N; j++)
    {
        for(b = 0; b < j; b++)
        {
            if(matr[b][j] < 0)
                s2 += matr[b][j];
        }
    }
    fprintf(F2, "Suma < 0 nad: %d\n", s2);
    printf("Suma < 0 nad: %d \n", s2);
    fclose(F2);
    getch();
    return 0;
}