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
Program 1
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
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
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
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View Comments
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