C program to print pyramid using star or any other character

C program to print a pyramid using star or any other character :

In this tutorial, we will learn how to print a pyramid using star ’*’ or any other character using ‘C programming language’. The user will input the height of the pyramid and we will print the pyramid equal to that height . It will look like as below :

    *
   ***
  *****
 *******
*********

The height of this pyramid is 5. So, how is it working ?

How the program works :

We are printing blank space and * to print this full pyramid. The height of the pyramid is 5. If we change the program to print # instead of space, it will be look like :

####*
###***
##*****
#*******
*********

Think # as space and height is 5 . Analysing the above pyramid, we can find out that :

1. First line : four # and one *. That means we will print four spaces and one * for the first line if height is 5.
2. Second line : three # and three *. That means we will print three spaces and three * for the second line if height is 4
3. From the above two lines , it is clear that we will print space for n times. n is the row number for the pyramid. For the first row, we are printing # for one time, for the second row, we are printing # two times etc.
4. After printing space, we will print * for 2*n - 1 time. Where n is the row number. For the first row, we are printing 2 * 1 - 1 = 1 time. For second line, we will print * for 2 * 2 - 1 = 3 times etc.
5. To print the full pyramid, we will use one for loop. The loop will run from 1 to the height of the pyramid. Using the above two method, we will print the full pyramid.

C program :

#include <stdio.h>

int main()
{
    int i, j, height;
    
    printf("Enter height of the pyramid : \n");
    scanf("%d", &height);
    
    for(i=1; i<=height; i++)
    {

        for(j=i; j<height; j++)
        {
            printf(" ");
        }
        
        for(j=1; j<=(2*i-1); j++)
        {
            printf("*");
        }
        
        printf("\n");
    }
    
    return 0;
}

Example Output :

Enter height of the pyramid :
5
    *
   ***
  *****
 *******
*********


Enter height of the pyramid :
10
         *
        ***
       *****
      *******
     *********
    ***********
   *************
  ***************
 *****************
*******************