Hollow Pyramid Pattern in C using nested while

In this tutorial, we will discuss Hollow Pyramid Pattern using nested while loop in C programming language

In this program, we are going to learn about how to display Hollow Pyramid Pattern using nested while loop in C programming language

Here, we display two Hollow pyramid Pattern programs with coding using nested while loop and also program get input from the user using scanf() function in C language

The user can provide numbers as they wish and get the Hollow pyramid pattern according to their input.

Hollow Pyramid Pattern 1

Hollow Pyramid triangle star pattern

Program 1

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

int main()
{
    int rows;
    printf("Enter the number of rows to Pyramid: ");
    scanf("%d",&rows);//get input from user for rows
    int i,j,k;
    i=1;
    while(i<=rows){//parent while loop(outer while)
        j=i;
        while(j<rows){
        printf(" ");//print initial space
        j++;
    }

    k=1;
while(k<2*i){
    if(i==rows || (k==1 || k==2*i-1))
        printf("*");//print star
    else
        printf(" ");//print space
    k++;
}
i++;
printf("\n");//Move to the next line for print
    }
getch();
return 0;
}

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

Hollow Pyramid Pattern 2

Inverted Hollow Pyramid triangle star pattern

Program 2

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

int main()
{
    int rows;
    printf("Enter the number of rows to Pyramid: ");
    scanf("%d",&rows);
    int i,j,k;
    i=rows;
    while(i>=1){//outer for loop
        j=rows;
        while(j>i){while loop print for space
        printf(" ");//print space
        j--;
    }

    k=1;
while(k<2*i){
    if(i==rows || (k==1 || k==2*i-1))
        printf("*");//print star
    else
        printf(" ");//print space
    k++;
}
i--;
printf("\n");//Move to the next line for print
    }
getch();
return 0;
}

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