Display Hollow rectangle and square star pattern in C++

Karmehavannan

6 years ago

Display Hollow rectangle and square star pattern in C++

In this article, we will discuss the concept of the Program to Display Hollow rectangle or square star pattern in C++ programming language

Display Hollow rectangle and square star pattern in C++ — Display Hollow pattern

In this post, we are going to learn how to write Hollow rectangle or square star pattern using for loop, while loop and Do-while loop with example programs

Program 1

Print Hollow rectangle or square star pattern

Using for loop

This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle or square pattern using for loop in C++ language

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int rows,columns,i,j;
    cout<<"Enter the number of rows\n";
   cin>>rows;//Takes input from user for rows
    cout<<"Enter the number of columns\n";
    cin>>columns;//Takes input from user for columns

    for (i=1; i<=rows; i++){
    for (j=1; j<=columns; j++){
    if(i==1||i==rows||j==1||j==columns){
        cout<<"*";
    }else{
        cout<<" ";
    }

}
    cout<<"\n";
}
getch();
    return 0;
}

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

Hollow rectangle and square star pattern in C++

Program 2

Using while loop

This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using while loop in C++ language

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int rows,columns,i,j;
    cout<<"Enter the number of rows\n";
   cin>>rows;
    cout<<"Enter the number of columns\n";
    cin>>columns;
  i=1;
    while(i<=rows){
            j=1;
    while( j<=columns){
    if(i==1||i==rows||j==1||j==columns){
        cout<<"*";
    }else{
        cout<<" ";
    }
j++;
}
    cout<<"\n";
    i++;
}
getch();
    return 0;
}

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

Program 3

Using the do-while loop

This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using the do-while loop in C++ language

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int rows,columns,i,j;
    cout<<"Enter the number of rows\n";
    cin>>rows;
    cout<<"Enter the number of columns\n";
    cin>>columns;

    i=1;
    do{
            j=1;
    do{
    if(i==1||i==rows||j==1||j==columns){
        cout<<"*";
    }else{
        cout<<" ";
    }
 j++;
}while(j<=columns);
    cout<<"\n";
     i++;
}while(i<=rows);
getch();
    return 0;
}

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