C 中的矩阵乘法 - 输入问题

Question

I've written a program which carries out matrix multiplication using functions. The function which i presume is wrong is as follows:

void obtainMatrixElems(int mtrx[][10], int row_elems, int col_elems){
    printf("Kindly enter matrix elements: \n");

    for(int x = 0; x < row_elems; x++){
        for(int y = 0; y < col_elems; y++){
            printf("Enter element at position %d,%d: \n", x+1, y+1);
            scanf("&d", &mtrx[x][y]);
        }
    }
}

Answer 1

It seems you are missing a "+" at multAns[x][y] = matrix1[x][y] * matrix2[x][y]; .

It should rather be:

// Also note the change variables used for referencing cells ...
multAns[x][y] += matrix1[x][z] * matrix2[z][y];

In case your last operation result is 0 then this explains why you get a 0 matrix..

EDIT:

The sign is one of the problems.. There is also something wrong with the way you get input from the user.

    for(int x = 0; x < row_elems; x++){
        for(int y = 0; y < col_elems; y++){
            printf("Enter element at position %d,%d: \n", x+1, y+1);
            // Note the change of "&" to "%" and the extra sequence
            // "\r\n" which expects the user to press ENTER (i.e.:
            // new line) between input cells
            rc = scanf("%d\r\n", &mtrx[x][y]);
            if (rc != 1) {
                printf("ERROR: scanf did not proceed as expected\r\n");
            }
        }
    }

Answer 2

There is an error in your call to scanf It should read

scanf("%d", &mtrx[x][y]);

Also take care with hitting the Enter Key after each input. To be safe you should catch it. Use something like

scanf(" %d", &mtrx[x][x]);