On February 7, 2021
By Karmehavannan
0 Comment
Categories: star pattern, While loop
Tags: Java language, Java pattern, Java programs, Pattern

Java code to Parallelogram star pattern using Do-while loop

In this article, we will discuss the concept of Java code to Parallelogram star pattern using Do-while loop

In this post, we are going to learn how to write a program to print parallelogram and Hollow parallelogram patterns using do-while loop in Java programming language.

Display parallelogram star patterns Using do-while loop

Code to print Parallelogram star pattern

C++ program to print Parallelogram star pattern using for loop — Parallelogram star pattern

Program 1

This program allows the user to enter the number of rows , columns and any symbols then it will display the parallelogram pattern using do-while loop in Java programming language

//code to print parallelogram star pattern
import java.util.Scanner;
public class parallelogramStar3{//class declaration
public static void main(String args[]){//main method

 Scanner scan=new Scanner(System.in); 
    //create a scanner object for input
    
System.out.println("Enter the number of rows: ");
//Ask input from the user to rows
int rows=scan.nextInt();
//Store the rows in the rows variable entered by user

System.out.println("Enter the number of columns: ");
//Ask input from the user to columns
int columns=scan.nextInt();
//Store the columns in the columns variable  entered by user

System.out.println("Enter Symbol as you wish: ");
//Ask input from the user as symbol
char ch=scan.next().charAt(0);
//Store the symbol in the ch variable entered by user

System.out.print("\n");
int i=1;
do{//outer while loop 
int j=0; 
do{//inner while loop
   System.out.print(" ");//print space
   j++;
   }while(j<=rows-i);
   j=1;
   do{//inner while loop
   System.out.print(ch);//print character after space
    j++;
}while(j<=columns);
 System.out.print("\n");//move to next line
  i++;
}while(i<=rows);
}
}

When the above code is executed, it produces the following result

Java code to Parallelogram star pattern using Do-while loop — Output

Code to print Hollow Parallelogram star pattern

Program 2

This program allows the user to enter the number of rows , columns and any symbols then it will display the hollow parallelogram pattern using do-while loop in Java programming language

//code to print Hollow parallelogram star pattern
import java.util.Scanner;
public class HollowparallelogramStar3{//class declaration
public static void main(String args[]){//main method

 Scanner scan=new Scanner(System.in);
    //create a scanner object for input
    
System.out.println("Enter the number of rows: ");
//Ask input from the user to rows
int rows=scan.nextInt();
//Store the rows in the rows variable entered by user

System.out.println("Enter the number of columns: ");
//Ask input from the user to columns
int columns=scan.nextInt();
//Store the columns in the column variable entered by user

System.out.println("Enter Symbol as you wish: ");
//Ask input from the user as symbol
char ch=scan.next().charAt(0);
//Store the symbol in the ch variable entered by user

System.out.print("\n");
int i=1; 
do{//outer for loop
int j=0;  
   do{//inner for loop
   System.out.print(" ");//print space
    j++;
   }while(j<=rows-i);
   j=1;
  do{//inner for loop
   if(i==1 || i==rows || j==1 || j==columns){
   System.out.print(ch);//print symbol after space
   }
   else{
         System.out.print(" ");//print space
   }
    j++;
} while(j<=columns);
 System.out.print("\n");//move to next line
  i++;
}while(i<=rows);
}
}

When the above code is executed, it produces the following result