Question

JAVA

Write nested while loop that will print out this pattern, based upon a number entered by the user. User enters 4: 1234 1234 1234 1234 User enters 2: 12 12

Answer 1

import java.util.*;
public class Pattern {

   public static void main(String[] args) {
       try {
       int value;
       Scanner scan=new Scanner(System.in);
       //Taking user input
System.out.print("Enter a number: ");
value=scan.nextInt();
if(value<=0)
   System.out.println("Please enter value greater than zero");
   else {
       int i=1,j=1;
//Looping to print the values
while(i<=value) {
   j=1;
   while(j<=value) {
       //If you want space between number,use below line
       //System.out.print(j+" ");
       //If you do not want space between number, use below line
       System.out.print(j);
       j=j+1;
   }
   System.out.print("\n");
   i=i+1;
}
   }
}
       catch(Exception e) {
           System.out.println("Enter only numbers");
       }
   }

}
Sample input and output:

Enter a number: 4
1234
1234
1234
1234

Enter a number: 2
12
12

//With spaces between numbers

Enter a number: 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4

Enter a number: 2
1 2
1 2