Java Multiplication Table

Question

I'm making a java program that shows the multiplication table that looks like this:

1

But I can only get the results from 1 to 5th column. How do I make the rest appear below ?

The program must only contain one for() nested loop.

This is my code so far:

import java.util.Scanner;
public class Table{
    public static void main(String[] args){

        Scanner s = new Scanner(System.in);
        System.out.print("Enter a number: ");

        int inputi = s.nextInt();

        for(int i = 1 ;i<=10;i++) {

            for(int j=1;j<=inputi && j <= 5;j++) {
                System.out.print(j + " x " + i + " = "  +(i*j) + "\t");
            }

            System.out.println();

            if(i >= 5)
            for(int j = 6; j <= inputi && j <= 10; j++){
                System.out.print(j + " x " + i + " = "  +(i*j) + "\t");
            }
        }

        System.out.println();
        System.out.println();
    }
}

Can anyone help ?

Thanks.

Edit: Sample input added.

Inputi = 7

Expected output:

Actual output:

Answer 1

This algorithm with only 2 layers of for loops will give you the correct output.

import java.util.Scanner;

public class Table {
    public static void main(String[] args){

        Scanner s = new Scanner(System.in);
        System.out.print("Enter a number: ");

        int inputi = s.nextInt();

        for(int i = 0; i < Math.ceil(inputi / 5.0) * 10; i++) {
            if ( i > 0 && i % 10 == 0 ) System.out.println();

            int t = inputi - 5 * (i / 10);
            for(int j = 0; j < (t > 5 ? 5 : t); j++) {
                int a = 5 * (i / 10) + j + 1;
                int b = i % 10 + 1;
                System.out.print(a + " x " + b + " = "  + (a * b) + "\t");
            }
            System.out.println();
        }
    }
}

Here is the sample output for input=11:

1 x 1 = 1   2 x 1 = 2   3 x 1 = 3   4 x 1 = 4   5 x 1 = 5   
1 x 2 = 2   2 x 2 = 4   3 x 2 = 6   4 x 2 = 8   5 x 2 = 10  
1 x 3 = 3   2 x 3 = 6   3 x 3 = 9   4 x 3 = 12  5 x 3 = 15  
1 x 4 = 4   2 x 4 = 8   3 x 4 = 12  4 x 4 = 16  5 x 4 = 20  
1 x 5 = 5   2 x 5 = 10  3 x 5 = 15  4 x 5 = 20  5 x 5 = 25  
1 x 6 = 6   2 x 6 = 12  3 x 6 = 18  4 x 6 = 24  5 x 6 = 30  
1 x 7 = 7   2 x 7 = 14  3 x 7 = 21  4 x 7 = 28  5 x 7 = 35  
1 x 8 = 8   2 x 8 = 16  3 x 8 = 24  4 x 8 = 32  5 x 8 = 40  
1 x 9 = 9   2 x 9 = 18  3 x 9 = 27  4 x 9 = 36  5 x 9 = 45  
1 x 10 = 10 2 x 10 = 20 3 x 10 = 30 4 x 10 = 40 5 x 10 = 50 

6 x 1 = 6   7 x 1 = 7   8 x 1 = 8   9 x 1 = 9   10 x 1 = 10 
6 x 2 = 12  7 x 2 = 14  8 x 2 = 16  9 x 2 = 18  10 x 2 = 20 
6 x 3 = 18  7 x 3 = 21  8 x 3 = 24  9 x 3 = 27  10 x 3 = 30 
6 x 4 = 24  7 x 4 = 28  8 x 4 = 32  9 x 4 = 36  10 x 4 = 40 
6 x 5 = 30  7 x 5 = 35  8 x 5 = 40  9 x 5 = 45  10 x 5 = 50 
6 x 6 = 36  7 x 6 = 42  8 x 6 = 48  9 x 6 = 54  10 x 6 = 60 
6 x 7 = 42  7 x 7 = 49  8 x 7 = 56  9 x 7 = 63  10 x 7 = 70 
6 x 8 = 48  7 x 8 = 56  8 x 8 = 64  9 x 8 = 72  10 x 8 = 80 
6 x 9 = 54  7 x 9 = 63  8 x 9 = 72  9 x 9 = 81  10 x 9 = 90 
6 x 10 = 60 7 x 10 = 70 8 x 10 = 80 9 x 10 = 90 10 x 10 = 100   

11 x 1 = 11 
11 x 2 = 22 
11 x 3 = 33 
11 x 4 = 44 
11 x 5 = 55 
11 x 6 = 66 
11 x 7 = 77 
11 x 8 = 88 
11 x 9 = 99 
11 x 10 = 110   

Answer 2

I would suggest to

1. Create separate variable with number of required columns
2. Calculate how many rows will be printed (see iterations)
3. Print rows one by one

Please, see the code snippet below:

int inputi = 12;
int columns = 5;
int iterations = inputi / columns + (inputi % columns > 0 ? 1 : 0);
for (int iter = 0; iter < iterations; iter++) {
    for (int i = 1; i <= 10; i++) {
        for (int j = iter * columns + 1; j <= Math.min(inputi, (iter + 1) * columns); j++) {
            System.out.print(j + " x " + i + " = "  +(i * j) + "\t\t");
        }
        System.out.println();
    }
    System.out.println();
}

Note, in case inputi is huge, you may have to fill outputs with additional spaces, to avoid layout issues, when you have statements like 1 x 1 = 1 and 1 x 10000000 = 1000000

Answer 3

This will give you the desired output:

import java.util.Scanner;

public class Table{
public static void main(String[] args){

    Scanner s = new Scanner(System.in);
    System.out.print("Enter a number: ");

    int inputi = s.nextInt();
    for(int i = 1 ;i<=10;i++) {

        for(int j=1;j<=inputi && j <= 5;j++) {
            System.out.print(j + " x " + i + " = "  +(i*j) + "\t");
        }

        System.out.println();
    }

    System.out.println();
    System.out.println();

    for(int i = 1 ;i<=10;i++) {

        for(int j=6;j<=inputi && j <= 10;j++) {
            System.out.print(j + " x " + i + " = "  +(i*j) + "\t");
        }

        System.out.println();
    }

  }
}