C program to print hollow square of stars

C program to print hollow square of stars

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:

hollow square of stars

 

 

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:

hollow square of stars

 

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