C program to Print Hollow Box Number Pattern

How to write a C program to Print Hollow Box Number Pattern with example. For this Hollow Box Number Pattern, we are going to use For Loop and While Loop.

C program to Print Hollow Box Number Pattern Example 1

This program allows the user to enter number of rows, and column values. Here, we are going to print hollow Box number pattern of 1’s. I mean, it will print First row, last row, first column, and last column as 1’s, and the remaining elements as empty.

First, we used the Nested for loop to iterate each and every row and column element. Next, we used If statement inside the Nested For Loop to check whether it is First row, First Column, Last row, or last column.

/* C program to Print Hollow Box Number Pattern */

#include<stdio.h>
 
int main()
{
    int i, j, rows, columns;
     
    printf(" \nPlease Enter the Number of Rows : ");
    scanf("%d", &rows);
    
    printf(" \nPlease Enter the Number of Columns : ");
    scanf("%d", &columns);
     
    for(i = 1; i <= rows; i++)
    {
    	for(j = 1; j <= columns; j++)
		{
			if(i == 1 || i == rows || j == 1 || j == columns)
			{
				printf("1");
			}
			else
			{
				printf(" ");
			}       	
        }
        printf("\n");
    }
    return 0;
}

OUTPUT

Program to Print Hollow Box Number Pattern Example 2

This program is same as first example, but this time we are using While loop (Just replacing For Loop with While Loop). I suggest you to refer While Loop to understand the loop Iteration.

/* C program to Print Hollow Box Number Pattern */

#include<stdio.h>
 
int main()
{
    int i, j, rows, columns;
    i = 1;
     
    printf(" \nPlease Enter the Number of Rows : ");
    scanf("%d", &rows);
    
    printf(" \nPlease Enter the Number of Columns : ");
    scanf("%d", &columns);
     
    while(i <= rows)
    {
    	j = 1;
    	while(j <= columns)
		{
			if(i == 1 || i == rows || j == 1 || j == columns)
			{
				printf("1");
			}
			else
			{
				printf(" ");
			}  
			j++;     	
        }
        i++;
        printf("\n");
    }
    return 0;
}

OUTPUT

Program to Print Hollow Box Number Pattern Example 3

This program is same as above example but we changed the printing number. I mean, this program will print Hollow box number pattern of 0’s. So, compiler will print 0’s in the First row, last row, first column, and last column.

/* C program to Print Hollow Box Number Pattern */

#include<stdio.h>
 
int main()
{
    int i, j, rows, columns;
     
    printf(" \nPlease Enter the Number of Rows : ");
    scanf("%d", &rows);
    
    printf(" \nPlease Enter the Number of Columns : ");
    scanf("%d", &columns);
     
    for(i = 1; i <= rows; i++)
    {
    	for(j = 1; j <= columns; j++)
		{
			if(i == 1 || i == rows || j == 1 || j == columns)
			{
				printf("0");
			}
			else
			{
				printf(" ");
			}       	
        }
        printf("\n");
    }
    return 0;
}

OUTPUT