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.

Example

Input

Input rows: 5

Output

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;
}

Output

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

Happy coding 😉

About Pankaj

Pankaj Prakash is the founder, editor and blogger at Codeforwin. He loves to learn new techs and write programming articles especially for beginners. He works at Vasudhaika Software Sols as a Software Design Engineer and manages Codeforwin. In short Pankaj is Web developer, Blogger, Learner, Tech and Music lover.

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