Display Hollow square star pattern in C++ using loops

Hollow rectangle pattern

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Display Hollow square star pattern in C++ using loops

In this tutorial, we will discuss the Display Hollow square star pattern in C++ using loops

We can display many types of number, Star, Alphabet patterns using for, while and do-while loop in C++ language

In this post, we are going to learn how to display Hollow square pattern Using for, while and do-while loop in C++ language

Using for loop

This program allows the user to enter the size of the pattern and then it displays Hollow square star pattern using for loop in C++ language

Program 1

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

int main()
{
    int size,row,coloum;
    cout<<"Enter the size for Hollow rectangle\n";
    cin>>size;
    //get input from the user for num1
for (row=1; row<=size; row++){
  cout<<"*";
}
cout<<"\n";
for (coloum=1; coloum<=size-2; coloum++){
  for (row=1; row<=size; row++){
  if(row==1||row==size){
    cout<<"*";
  }else{
    cout<<" ";
  }

}
  cout<<"\n";
}
for(row=1; row<=size; row++){
  cout<<"*";
}
cout<<"\n";
getch();
    return 0;
}

When the above code is executed it produces the following output

Output

Approach

The program requests to input for the “size of the pattern”
The input stores in the variable “size”
To iterate through the row, run the first for loop from 1 to given size according to the loop structure for (row=1; row<=size; row++) to print star for first-line
To iterate through the column, run the outer for loop from 1 to given size according to the loop structure for (coloum=1; coloum<=size-2; coloum++)
Inner for loop print star when the if statement is satisfied if(row==1||row==size) otherwise print space
This activity continues until the condition of outer while loop becomes false
Finally run the last for loop from 1 to given size according to the loop structure for(row=1; row<=size; row++) to print star for last line

Program 2

Using while loop

This program allows the user to enter the size of the pattern and then it displays Hollow square star pattern using while loop in C++ language

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

int main()
{
    int size,row,coloum;
    cout<<"Enter the size for Hollow rectangle\n";
    cin>>size;
    //get input from the user for num1
    row=1;
while( row<=size){
  cout<<"*";
  row++;
}
cout<<"\n";
coloum=1;
while(coloum<=size-2){
        row=1;
  while(row<=size){
  if(row==1||row==size){
    cout<<"*";
  }else{
    cout<<" ";
  }
row++;
}
  cout<<"\n";
  coloum++;
}
row=1;
while( row<=size){
  cout<<"*";
  row++;
}
cout<<"\n";
getch();
    return 0;
}

When the above code is executed it produces the following output

Output

Approach

The program requests to input for the “size of the pattern”
The input stores in the variable “size”
To iterate through the row, run the first for loop from 1 to given size according to the loop structure while( row<=size) to print star for first-line
To iterate through the column, run the outer for loop from 1 to given size according to the loop structure while(coloum<=size-2)
Inner while loop print star when the if statements satisfied if(row==1||row==size) otherwise print space
This activity continues until the condition of outer while loop becomes false
Finally, run the last for loop from 1 to given size according to the loop structure while( row<=size) to print star for the last line

Program 3

Using the do-while loop

This program allows the user to enter the size of the pattern and then it displays Hollow square star pattern using the do-while loop in C++ language

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

int main()
{
    int size,row,coloum;
    cout<<"Enter the size for Hollow rectangle\n";
    cin>>size;
    //get input from the user for num1
    row=1;
do{
  cout<<"*";
  row++;
}while( row<=size);
cout<<"\n";
coloum=1;
do{
        row=1;
  do{
  if(row==1||row==size){
    cout<<"*";
  }else{
    cout<<" ";
  }
row++;
}while(row<=size);
  cout<<"\n";
  coloum++;
}while(coloum<=size-2);
row=1;
do{
  cout<<"*";
  row++;
}while( row<=size);
cout<<"\n";
getch();
    return 0;
}

When the above code is executed it produces the following output

Output

Approach

The program requests to input for the “size of the pattern”
The input stores in the variable “size”
To iterate through the row, run the first do-while loop from 1 to given size according to the loop structure while( row<=size) to print star for the first line
To iterate through the column, run the outer dowhile loop from 1 to given size according to the loop structure while(coloum<=size-2)
Inner do-while loop print star when the if statements satisfied if(row==1||row==size) otherwise print space
This activity continues until the condition of outer while loop becomes false
Finally run the last do-while loop from 1 to given size according to the loop structure while( row<=size) to print star for the last line