Question

I need help, I got a problem with this matrix, I need to have it in this way:

1 2  3  4 = 10
2 4  6  8 = 20
3 6  9 12 = 30
4 8 12 16 = 40

But I have it in this way:

1 2 3 4 1
2 4 6 8 2
3 6 9 12 3
4 8 12 16 4

I dont know how can we do that, I intent but nothing

This is my code:

public class Matrix {

    public static void main(String args[]) {

        int mult = 4;


        for (int i = 1; i <= mult; i++) {
           // System.out.println();


            for (int j = 1; j <= mult; j++) {
                int operacion = i * j;
                int suma = 0;
                suma = operacion + suma;

                System.out.print(operacion + " ");

            }


            int sum = 0;
            sum = i + sum;
            System.out.println(sum);


        }
    }
}

bye

Answer 1

When you do this:

for (int j = 1; j <= mult; j++) {
    int operacion = i * j;
    int suma = 0;
    suma = operacion + suma;

suma is always equal to operacion, because you set it to 0 every time and then add operacion.

You want to do this:

int suma = 0;
for (int j = 1; j <= mult; j++) {
    int operacion = i * j;
    suma += operacion;