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 C++ 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

C++ Program to 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