Display Hollow square star pattern in C using loops

Display Hollow Square star pattern in C using loops

In this tutorial, we will discuss the Display Hollow square star pattern in C using loops

We can display many types of number, Star, Alphabet patterns using for, while and do-while loop in C language.

In this post, we are going to learn how to display Hollow square star pattern  Using for, while and do-while loop in C language

Using for loop

This program allows the user to enter the size of the pattern and then it displays Hollow square star pattern using for loop in C language

Program 1

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

int main()
{
    int size,row,coloum;
    printf("Enter the size for Hollow rectangle\n");
    scanf("%d",&size);
    //get input from the user for num1
for (row=1; row<=size; row++){
  printf("*");
}
printf("\n");
for (coloum=1; coloum<=size-2; coloum++){
  for (row=1; row<=size; row++){
  if(row==1||row==size){
    printf("*");
  }else{
    printf(" ");
  }

}
  printf("\n");
}
for(row=1; row<=size; row++){
  printf("*");
}
printf("\n");
getch();
    return 0;
}

When the above code is executed it produces the following output

Approach

• The program requests to input for the “size of the pattern”
• The input stores in the variable “size”
• To iterate through the row, run the first for loop from 1 to given size according to the loop structure for (row=1; row<=size; row++) to print star for first-line
• To iterate through the column, run the outer for loop from 1 to given size according to the loop structure for (coloum=1; coloum<=size-2; coloum++)
• Inner for loop print star when the if statement is satisfied if(row==1||row==size) otherwise print space
• This activity continues until the condition of outer while loop becomes false
• Finally run the last for loop from 1 to given size according to the loop structure for(row=1; row<=size; row++) to print star for last line

Using while loop

This program allows the user to enter the size of the pattern and then it displays Hollow square star pattern using while loop in C language

Program 1

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

int main()
{
    int size,row,coloum;
    printf("Enter the size for Hollow rectangle\n");
    scanf("%d",&size);
    //get input from the user for num1

    while( row<=size+1){
  printf("*");
  row++;
}
printf("\n");
coloum=1;
while(coloum<=size-2){
  row=1;
  while( row<=size){
  if(row==1||row==size){
    printf("*");
  }else{
    printf(" ");
  }
  row++;
}
  printf("\n");
  coloum++;
}
row=1;
while(row<=size){
  printf("*");
  row++;
}
printf("\n");
getch();
return 0;
}

 

 

When the above code is executed it produces the following output

Approach

• The program requests to input for the “size of the pattern”
• The input stores in the variable “size”
• To iterate through the row, run the first for loop from 1 to given size according to the loop structure while( row<=size) to print star for first-line
• To iterate through the column, run the outer for loop from 1 to given size according to the loop structure while(coloum<=size-2)
• Inner while loop print star when the if statements satisfied if(row==1||row==size) otherwise print space
• This activity continues until the condition of outer while loop becomes false
• Finally, run the last for loop from 1 to given size according to the loop structure while( row<=size) to print star for the last line

Using the do-while loop

This program allows the user to enter the size of the pattern and then it displays Hollow square star pattern using the do-while loop in C language

Program 3

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

int main()
{
    int size,row,coloum;
    printf("Enter the size for Hollow rectangle\n");
    scanf("%d",&size);
    //get input from the user for num1

    do{
  printf("*");
  row++;
}while( row<=size+1);
printf("\n");
coloum=1;
do{
  row=1;
  do{
  if(row==1||row==size){
    printf("*");
  }else{
    printf(" ");
  }
  row++;
}while( row<=size);
  printf("\n");
  coloum++;
}while(coloum<=size-2);
row=1;
do{
  printf("*");
  row++;
}while(row<=size);
printf("\n");
getch();
return 0;
}

When the above code is executed it produces the following output