C Program to Print Inverted Right Triangle Star Pattern

Here is a C program to print a inverted right angles triangle pattern of star character using loops. For a inverted right triangle star pattern of 7 rows. Program's output should be:

C program inverted right triangle star pattern

Required Knowledge

Algorithm to print inverted right triangle star pattern using loop
If you look closely, this pattern is the vertically inverted pattern of right triangle star pattern. As the row number increases from top to bottom, number of stars in a row decreases.
NOTE: The index of rows and columns starts from 0.

Take the number of rows(N) of inverted right triangle as input from user using scanf function.

Number of stars in K^th row is equal to (N - K + 1). In the pattern given above, N = 7. Hence, 1^st row contains 7 star, 2^nd row contains 6 stars, 3^rd row contains 5 stars.

We will use two for loops to print inverted right triangle star pattern.

For a inverted right triangle star pattern of N rows, outer for loop will iterate N time(from i = 0 to N-1). Each iteration of outer loop will print one row of the pattern.

For j^th row of inverted right triangle pattern, inner loop will iterate N-j times(from j = 0 to N-j). Each iteration of inner loop will print one star character.

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

C program to print inverted right triangle 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++) {
        /* Prints one row of triangle */
        for(j = 0; j < rows - i; j++) {
            printf("* ");
        }
        /* move to next row */
        printf("\n");
    }
    return 0;
}

Output

Enter the number of rows
7
* * * * * * * 
* * * * * * 
* * * * * 
* * * * 
* * * 
* * 
*

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