C program to print reverse Pyramid star pattern

Write a C program to print reverse Pyramid or reverse equilateral triangle star pattern series using for loop. How to print inverted pyramid or inverted equilateral triangle star pattern series in C program. Logic to print reverse pyramid star pattern series in C programming.

Input rows: 5

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

Required knowledge

Basic C programming, For loop, Nested loop

Logic to print reverse pyramid star pattern

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

The above pattern has N (in this case 5) rows. Each row has exactly N * 2 - (i * 2 - 1) stars. In addition the pattern consists of leading spaces. For each row it contain i – 1 leading space (where i is current row number).

Step by step descriptive logic to print reverse pyramid star pattern.

1. Input number of rows to print from user. Store it in a variable say rows.
2. To iterate through rows, run an outer loop from 1 to rows. The loop structure should look like for(i=1; i<=rows; i++).
3. To print spaces, run an inner loop from 1 to i - 1. The loop structure should look like for(j=1; j<i; j++). Inside this loop print single space.
4. To print stars, run another inner loop from 1 to rows * 2 - (i * 2 - 1). The loop structure should look like for(j=1; j<= (rows*2 - (i*2-1)); j++). Inside this loop print star.
5. After printing all stars for each row, move to next line i.e. print new line.

Program to print reverse pyramid star pattern

/**
 * C program to print reverse pyramid star pattern 
 */

#include <stdio.h>

int main()
{
    int i, j, rows;

    /* Input rows to print from user */
    printf("Enter number of rows : ");
    scanf("%d", &rows);

    for(i=1; i<=rows; i++)
    {
        /* Print leading spaces */
        for(j=1; j<i; j++)
        {
            printf(" ");
        }

        /* Print stars */
        for(j=1; j<=(rows*2 -(2*i-1)); j++)
        {
            printf("*");
        }

        /* Move to next line */
        printf("\n");
    }

    return 0;
}

Enter number of rows: 5
*********
 *******
  *****
   ***
    *

Happy coding 😉