Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java

Dylan Fried
Dylan Fried
3,123 Points

Nested for loop multiplication table help

The output has to be:
9*9= 81 9*8=72 9*7=63 9*6=54 9*5=45 9*4=36 9*3=27 9*2=18 9*1=9
8*8=64 8*7=56. . .
this will decrease until it reaches 1*1=1
I'm having trouble in decreasing the second number.

public class $1_8{
    public static void main(String[] args){
        int num1 = 9, num2 = 9;
        for(int i = 9; i >= 1; i--){
              for(int n = 1; n <=i; n++){
              int sum = num1 * num2;
              System.out.println(num1 + "*" + num2 + "=" + sum + "\t");
        }
       num1--;
       System.out.println();
   }
  }
}

1 Answer

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,736 Points

You have two variables num1 and num2 for the multipliers, and also two variables i and n and you're using to keep track of how many times you've gone through a loop. I suggest just using num1 and num2 for both purposes.

public static void main(String[] args){
        for(int num1 = 9; num1 >= 1; num1--){
            for(int num2 = 9; num2 >= 1; num2--){
                int sum = num1 * num2;
                System.out.println(num1 + "*" + num2 + "=" + sum + "\t");
            }
            num1--;
            System.out.println();
        }
    }