C program to print hollow square of stars

September 30, 2019

In this article, I will show you, How to write a C program to print hollow square star pattern. Here, one thing is important to know that all sides of the square must be the same.

Logic to write C program to print hollow square star pattern:

It is very easy to print a hollow square star pattern in C, below I have mentioned a few steps to print a hollow square pattern in C:

You must know the side of the square.
There should be two-loop, inner and outer.
Inner loop print star for first and last row or for the first and last column. Otherwise, it prints the space.
After completing each iteration of the inner loop, the outer loop prints the new line.

See the, C program to print hollow square star pattern:

Here, I have mentioned two methods to print hollow square star pattern.

Method1:

#include <stdio.h>

int main()
{
    int x = 0,y = 0;
    unsigned int squareSide = 0;


    printf("Enter Side of a Square = ");
    scanf("%u",&squareSide);

    for(x=1; x<=squareSide; ++x)
    {
        for(y=1; y<=squareSide; ++y)
        {
            if((x==1) || (x==squareSide) || (y==1) || (y==squareSide))
            {
                //Print star
                printf("*");
            }
            else
            {
                //Print space
                printf(" ");
            }
        }
        // Print new line
        printf("\n");
    }

    return 0;
}

Output:

Method2:

#include <stdio.h>

#define isBorder(x,y,n) ((x==1) || (x==n) || (y==1) || (y==n))

int main()
{
    int x = 0,y = 0;
    unsigned int squareSide = 0;

    printf("Enter Side of a Square = ");
    scanf("%u",&squareSide);

    for(x=1; x<=squareSide; ++x)
    {
        for(y=1; y<=squareSide; ++y)
        {
            isBorder(x,y,squareSide)? printf("*"):printf(" ");
        }
        // Print new line
        printf("\n");
    }
    return 0;
}

Output:

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