CODEWITHSUNDEEP
javafor-loop
phillipsK
phillipsK

Reputation: 1516

For Loop printing squares without multiplication

I am trying to produce this output without multiplication:

81 100 121 144 169 196 225 256 289

I produced that with this for loop:

    for (int k = 9; k <=17; k++){

        System.out.print( k * k +" ");
    }

But again, I am trying to create a for loop or nested for loops producing the same output without multiplication.

Pseudocode:
Start with value 81
Increment by 19
On the second loop add ++3 to the 19 value

I have not been able to get to the second for loop stage I am confused. Any feedback or push in the right direction is appreciated.

/**
 * Created on 8/28/15.
 * Following Reges, Stuart, and Martin Stepp. Building Java Programs: A Back to Basics Approach. 3rd Edition.
 * Chapter 2 Self-Check Problems & Exercises
 */
public class Ch2_SelfCheckProblems {

          public static void main(String[] args) {
        ex2();    
    }

    public static void ex2(){
        for (int i = 81; i <= 289; i=i+19){
                /*for (int j = 1; j >=( i - 81 );j++){
//                    System.out.print(j+" ");
//                    System.out.print(i + " ");
                }*/
//            System.out.print(i + " ");
        }
//        System.out.println();

/*        for (int k = 9; k <=17; k++){

            System.out.print( k * k +" ");
        }*/
        for (int k = 81; k <=289; k++){
            for (int j = 1; j <= 1; j++){
                k = k + 8;
            }
            System.out.print( k +" ");
        }
    }

Upvotes: 0

Views: 928

Answers (1)

Elliott Frisch
Elliott Frisch

Reputation: 201527

If I understand your question, you could use addition instead of multiplication. Something like

public static void main(String[] args) {
    for (int k = 9; k <= 17; k++) {
        int t = 0;
        for (int j = 0; j < k; j++) {
            t += k;
        }
        System.out.print(t + " ");
    }
    System.out.println();
}

Output is (the requested)

81 100 121 144 169 196 225 256 289

Another option would be Math.pow(double, double)

public static void main(String[] args) {
    for (int k = 9; k <= 17; k++) {
        System.out.print((int) Math.pow(k, 2) + " ");
    }
    System.out.println();
}

for the same output. Finally, from @mschauer's comments below, you could also use something like

public static void main(String[] args) {
    for (int r = 64, k = 9; k < 18; k++) {
        r += k + k - 1;
        System.out.printf("%d ", r);
    }
    System.out.println();
}

Upvotes: 3

Related Questions