C++ Program to Print Hollow Box Number Pattern

Write a C++ Program to Print Hollow Box Number Pattern using For Loop with an example. In this example, we used the if statement inside the nested for loop to check for the box borders. If it is a box border, print 1; otherwise, print empty space.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns;
     
    cout << "\nPlease Enter the Number of Rows = ";
    cin >> rows;
    
    cout << "\nPlease Enter the Number of Columns = ";
    cin >> columns;
     
    cout << "\n---Hallow Box Number Pattern-----\n";
    for(i = 1; i <= rows; i++)
    {
    	for(j = 1; j <= columns; j++)
		{
			if(i == 1 || i == rows || j == 1 || j == columns)
			{
				cout << "1";
			}
			else
			{
				cout << " ";
			}       	
        }
        cout << "\n";
    }
		
 	return 0;
}

C++ Program to Print Hollow Box Pattern of Zeros

Here, we replaced 1 with 0.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns;
     
    cout << "\nPlease Enter the Number of Rows = ";
    cin >> rows;
    
    cout << "\nPlease Enter the Number of Columns = ";
    cin >> columns;
     
    cout << "\n---Hallow Box Number Pattern-----\n";
    for(i = 1; i <= rows; i++)
    {
    	for(j = 1; j <= columns; j++)
		{
			if(i == 1 || i == rows || j == 1 || j == columns)
			{
				cout << "0";
			}
			else
			{
				cout << " ";
			}       	
        }
        cout << "\n";
    }
		
 	return 0;
}

Please Enter the Number of Rows = 7

Please Enter the Number of Columns = 15

---Hallow Box Number Pattern-----
000000000000000
0             0
0             0
0             0
0             0
0             0
000000000000000

This Program will Print Hollow Box Number Pattern using While Loop.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns;
     
    cout << "\nPlease Enter the Number of Rows = ";
    cin >> rows;
    
    cout << "\nPlease Enter the Number of Columns = ";
    cin >> columns;
     
    cout << "\n---Hollow Box Number Pattern-----\n";
    i = 1; 
    while(i <= rows)
    {
    	j = 1; 
    	while(j <= columns)
		{
			if(i == 1 || i == rows || j == 1 || j == columns)
			{
				cout << "1";
			}
			else
			{
				cout << " ";
			}     
			j++;  	
        }
        cout << "\n";
        i++;
    }
		
 	return 0;
}

Please Enter the Number of Rows = 7

Please Enter the Number of Columns = 16

---Hollow Box Number Pattern-----
1111111111111111
1              1
1              1
1              1
1              1
1              1
1111111111111111

In this C++ Hollow Box Number Pattern example, we allow the user to enter his/her own number to print in the borders.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns, num;
     
    cout << "\nPlease Enter the Number of Rows = ";
    cin >> rows;
    
    cout << "\nPlease Enter the Number of Columns = ";
    cin >> columns;
    
    cout << "\nPlease Enter Any Integer Value = ";
    cin >> num;
     
    cout << "\n---Hallow Box Number Pattern-----\n";
    for(i = 1; i <= rows; i++)
    {
    	for(j = 1; j <= columns; j++)
		{
			if(i == 1 || i == rows || j == 1 || j == columns)
			{
				cout << num;
			}
			else
			{
				cout << " ";
			}       	
        }
        cout << "\n";
    }
		
 	return 0;
}

Please Enter the Number of Rows = 12

Please Enter the Number of Columns = 25

Please Enter Any Integer Value = 9

---Hallow Box Number Pattern-----
9999999999999999999999999
9                       9
9                       9
9                       9
9                       9
9                       9
9                       9
9                       9
9                       9
9                       9
9                       9
9999999999999999999999999