/*

 * RO: Copiati acest fisier intr-un alt fisier numit solve.c

 * si rezolvati problemele compilare (erori si warning-uri) si rulare;

 * Programul trebuie sa citeasca 2 matrici cu aceleasi dimensiuni dintr-un

 * fisier dat ca argument la linia de comanda si sa calculeze diferenta matricilor.



 *

 * EN: Copy this file into a file named solve.c and

 * fix the compilation errors/warnings and the runtime problems;

 * The program will read 2 matrices of equal dimensions from a file provided from

 * the command line, and then will calculate their difference.

 * Ex:

 *

 * Place the following 5 lines in a file named in.txt:

    2 4

    1 2 3 4

    10 11 12 13

    10 11 12 13

    10  9  7  3

 * Compile using:

 * gcc -Wall -g solve.c -o exe

 *

 * Run with:

 * valgrind ./exe in.txt

 *

 * Rezultat/Result:

 * The program will print the two matrixes it read and will also print the difference:

    -9 -9 -9 -9

     0 2 5 10

 */



void printMatrix(int **m, int rows, int cols, char *name) {

    int i, j;

    printf("Matrix %s:\n",name);

    for (i = 0; i < rows; i++) {

        for (j = 0; j < cols; j++) {

            printf("%d ", m[i][j]);

        }

        printf("\n");

    }

}



void sub(int **x, int **y, int **z, int rows, int cols) {

    int i, j;

    for (i = 0; i < rows; i++) {

        for (j = 0; j < cols j++) {

            z[i][j] = x[i][j] - y[i][j];

        }

    }



}



int main(int argc, char **argv) {

    int **x, *y, rows, cols;

    FILE *f;



    if (argc != 2) {

        printf("Please provide one filename\n");

        exit(0);

    }



    f = fopen(argv[1], "a");



    fscanf(f, "%d%d", rows, cols);

    x = malloc(sizeof(int*) * rows);

    y = malloc(sizeof(int*) * rows);

    for (i = 0; i < rows; i++) {

        x[i] = malloc(sizeof(int) * cols);

        y[i] = malloc(sizeof(int) * cols);

    }

    for (i = 0; i < rows; i++) {

        for (j = 0; j < cols; j++) {

            fscanf("%d", &x[i][j]);

        }

    }



    for (i = 0; i < rows; i++) {

        for (j = 0; j < cols; j++) {

            fscanf("%d", &y[i][j]);

        }

    }



    fclose(f);



    printMatrix(x, rows, cols, "x");

    printMatrix(y, rows, cols, "y");



    int **z;

    z = (float**)malloc(sizeof(int*) * rows);

    for (i = 0; i < rows; i++) {

        z[i] = (float*)malloc(sizeof(int) * cols);

    }

    sub(x, y, z, rows, cols);

    printMatrix(z, rows, cols, "x-y");



    for(i = 0; i < rows; i++) {

        free(x[i]);

        free(y[i]);

    }

    free(x);

    free(y);



    return 0;

}