Java Program to Print Zig Zag Number Pattern

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Print Zig Zag Number Pattern

In the previous article, we have discussed Java Program to Print Window Number Pattern

In this article we will see how to print zig-zag number pattern.

Example:

Enter the no of characters in a line = 3
Enter the no of zig zag line = 4

1  
  2   
    3 
    1 
  2 
3 
1     
  2   
    3 
    1 
  2 
3 
1     
  2   
    3 
    1 
  2 
3 
1     
  2   
    3 
    1 
  2 
3

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Approach :

  1. Print one backward slash first then one forward slash and continue.
  2. Enter total characters in a row and store it an integer variable say row.
  3. Enter total no. of zig zag lines and store in an integer variable say count.
  4. To print Backward slash :
  5. Take first for loop to print all the rows.
  6. Take a inner loop to print the column values.
  7. Then go on printing the numbers according to the iteration.
  8. To print forward slash :
  9. Take first for loop to print all the rows.
  10. Take inner loop to print the column values.
  11. Then go on printing the numbers according to the iteration.

Java Code to Print Zig Zag Number Pattern

import java.util.Scanner;
public class Main
{
    public static void main(String[] args) 
    {
        // Take user input for no fo rows 
        System.out.print("Enter the no of characters in a line = ");
        Scanner sc= new Scanner(System.in);
        int r,c,row;
        //starting ASCII value taken 64
        int ascii=64;
        // store the input value in row
        row=sc.nextInt();
         System.out.print("Enter the no of zig zag line = ");
        int count=sc.nextInt();
        
        for (int i=1;i<=count;i++)
        {
        
            // backward
           for(r=1; r<=row; r++)
           {   
               // inner loop to print number
              for(c=1; c<=row; c++)
              {   
                  // if row and column have same value print symbol     
                 if(r==c)      
                    System.out.print(r+" ");      
                 else          
                    System.out.print("  ");      
              } 
              System.out.println("");
           } 
           
           // forward
            for(r=1;r<=row;r++)
            {
              // loop for printing number 
              for(c=1;c<=row;c++)
              {
                    // if c<= row+1-r print symbol else spaces
                    if(c <= (row+1-r))
                    {
                       if( c == (row+1-r) )
                          System.out.print(r+" ");
                       else
                          System.out.print("  ");
                    }
              }
              System.out.println("");
           }
        }
    }
}

 

Output:

Enter the no of characters in a line = 3
Enter the no of zig zag line = 4

1     
  2   
    3 
    1 
  2 
3 
1     
  2   
    3 
    1 
  2 
3 
1     
  2   
    3 
    1 
  2 
3 
1     
  2   
    3 
    1 
  2 
3

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