C program to print reverse pyramid star pattern

  • Write a C program to print reverse pyramid star pattern.
  • How to print inverted equilateral triangle star pattern till n rows using loops.
For an reversed equilateral triangle pyramid star pattern of 5 rows. Program's output should be:
C program reverse pyramid star pattern

Required Knowledge

Algorithm to print inverted pyramid star pattern using loop
This C program is similar to pyramid star pattern, except we are printing the rows in reverse order.
  • We first take the number of rows(R) in the pattern as input from user using scanf function.
  • Outer for loop(from i = 0 to R-1) will print a row of inverted pyramid in one iteration.
  • For jth row, inner for loops first prints i spaces followed by (2*(R-i) - 1) star character.

Here is the matrix representation of the inverted pyramid star pattern. The row numbers are represented by i whereas column numbers are represented by j.

C program inverted pyramid star pattern

C program to print inverted pyramid star pattern

#include<stdio.h>

int main() {
    int i, j, rows;
    printf("Enter the number of rows\n");
    scanf("%d", &rows);

    for (i = 0; i < rows; i++) {
        /* Printing spaces */
        for (j = 0; j < i; j++) {
            printf(" ");
        }
        /* Printing stars */
        for (j = 0;j < 2*(rows-i)-1; j++) {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}
Output
Enter the number of rows
5
*********
 *******
  *****
   ***
    *

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