Print Hollow rectangle and square star pattern in C

In this article, we will discuss the concept of Program to Print Hollow rectangle or square star pattern in C programming language

In this post, we are going to learn How to write a C program to print Hollow rectangle or square star pattern using for loop, while loop and Do-while loop with example programs

Print Hollow rectangle and square star pattern in C — Hollow pattern

Program 1

Print Hollow rectangle or square star pattern

Using for loop

This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using for loop in C programming language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int rows,columns,i,j;
    printf("Enter the number of rows\n");
    scanf("%d",&rows);
    printf("Enter the number of columns\n");
    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("*");
    }else{
        printf(" ");
    }

}
    printf("\n");
}
getch();
    return 0;
}

When the above code is executed, it produces the following results

Program 2

Using while loop

This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using while loop in C language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int rows,columns,i,j;
    printf("Enter the number of rows\n");
    scanf("%d",&rows);
    printf("Enter the number of columns\n");
    scanf("%d",&columns);

    i=1;
    while(i<=rows){
            j=1;
    while(j<=columns){
    if(i==1||i==rows||j==1||j==columns){
        printf("*");
    }else{
        printf(" ");
    }
 j++;
}
    printf("\n");
     i++;
}
getch();
    return 0;
}

When the above code is executed, it produces the following results

Program 3

Using the do-while loop

This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using the do-while loop in C language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int rows,columns,i,j;
    printf("Enter the number of rows\n");
    scanf("%d",&rows);
    printf("Enter the number of columns\n");
    scanf("%d",&columns);

    i=1;
    do{
            j=1;
    do{
    if(i==1||i==rows||j==1||j==columns){
        printf("*");
    }else{
        printf(" ");
    }
 j++;
}while(j<=columns);
    printf("\n");
     i++;
}while(i<=rows);
getch();
    return 0;
}

When the above code is executed, it produces the following results

Suggested for you

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while loop in C language

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Nested Do-while loop in C language

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Datatype in C language

Variable in C language

1 Comment

Diagassama June 1, 2021 at 11:06 pm

Hello,
Thank you for helping people!
I well understood how printing a rectangle with stars.
Now, can help about a mixed characters within a rectangle, namely : the first character must be a star (‘*’) at (0,0) and next for each step of d called density ‘*’ or the character ‘.’ either.
Input data are : width, height and the density d (each d characters * is printed)*
E.g.: for w=5, h= 5 and =2
*.*.*
.*.*.
*.*.*
.*.*.
*.*.*

Thank’s

Print Hollow rectangle and square star pattern in C

Print Hollow rectangle and square star pattern in C