Java Program to Print Zig Zag Star Pattern

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Program to Print Zig Zag Star Pattern

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

Example-1

When no of characters in a line : 3
When no of zig zag lines : 4
*
 *
  *
  *
 *
*
*
 *
  *
  *
 *
*

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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 star symbols 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. Print the star symbol if c==(row+1-r).

JAVA Code:

Method-1 : Static Star Character

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;
        // 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 symbol
              for(c=1; c<=row; c++)
              {   
                  // if row and column have same value print symbol     
                 if(r==c)      
                    System.out.print("* ");      
                 else          
                    System.out.print("  ");      
              } 
              System.out.println("");
           } 
           
           // forward
            for(r=1;r<=row;r++)
            {
              // loop for printing star symbol
              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("* ");
                       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
*
 *
  *
  *
 *
*
*
 *
  *
  *
 *
*

Method-2 : User Input Character

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;
        // store the input value in row
        row=sc.nextInt();
         System.out.print("Enter the no of zig zag line = ");
        int count=sc.nextInt();
        System.out.print("Enter any character = ");
        char ch=sc.next().charAt(0);
        
        for (int i=1;i<=count;i++)
        {
        
            // backward
           for(r=1; r<=row; r++)
           {   
               // inner loop to print symbol
              for(c=1; c<=row; c++)
              {   
                  // if row and column have same value print symbol     
                 if(r==c)      
                    System.out.print(ch+" ");      
                 else          
                    System.out.print("  ");      
              } 
              System.out.println("");
           } 
           
           // forward
            for(r=1;r<=row;r++)
            {
              // loop for printing star symbol
              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(ch+" ");
                       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
Enter any character = @
@
 @
  @
  @
 @
@
@
 @
  @
  @
 @
@

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