使用Java循环制作时间表

Question

I'm trying to make a Java program that creates multiplication tables using nested for loops by asking the user for upper bounds and display the following result such as this (first image attached). Desired format

However, my code is causing it the program to only print out the multiple of the two inputs and looping that the same amount of times as the multiple. For example in here (second image attached), if it put in the input as 3 and 5, it is displaying 15 to me 15 times. My displayed format

This is what my code looks like (last image attached):

My code

Thank you all so much in advance. Please help me out!!! I've been stuck on this for a while.

Answer 1

Try this:

public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int firstFactor = 0;
        int secondFactor = 0;
        System.out.print("Enter the first factor: ");
        firstFactor = s.nextInt();
        System.out.print("Enter the second factor: ");
        secondFactor = s.nextInt();
        for(int i=1; i<=firstFactor; i++) {
            for(int j=1; j<=secondFactor; j++) {
                System.out.println(i + " * " + j + " = " + i*j);
            }
            System.out.println();
        }
    }

Output:

Enter the first factor: 3
Enter the second factor: 5
1 * 1 = 1
1 * 2 = 2
1 * 3 = 3
1 * 4 = 4
1 * 5 = 5

2 * 1 = 2
2 * 2 = 4
2 * 3 = 6
2 * 4 = 8
2 * 5 = 10

3 * 1 = 3
3 * 2 = 6
3 * 3 = 9
3 * 4 = 12
3 * 5 = 15

Modifications:

1. Change firstFactor*secondFactor to i*j . Since firstFactor was 3 and secondFactor was 5 . Hence you were getting 15 as an output each time.

Answer 2

I would strongly suggest not using an image for your code. You can just add it as part of your question using the provided edit tools (or Ctrl+k). Anyway, from a quick look your code looks fine with one bug. You just need to do this:

System.out.println(i*j)

Where you had:

System.out.println(firstFactor*secondFactor)

Those are set to input values and do not change during the loop.

Answer 3

Change your first and second factor to i and j.

for(int i=1;i<=3;i++) {
        for(int j=1; j<=5; j++) {
            System.out.print("i: "+i+" j: "+j);
            System.out.println(" Value: "+i*j);
        }
    }