C Program to Print Right Triangle Star Pattern

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

C program right angle triangle star pattern

Required Knowledge

Algorithm to print right triangle star pattern using loop
  • Take the number of rows(N) of right triangle as input from user using scanf function.
  • Number of stars in Kth row is always K. 1st row contains 1 star, 2nd row contains 2 stars, 3rd row contains 3 stars. In general, Kth row contains K stars.
  • We will use two for loops to print right triangle star pattern.
    • For a right triangle star pattern of N rows, outer for loop will iterate N time. Each iteration of outer loop will print one row of the pattern.
    • For Kth row of right triangle pattern, inner loop will iterate K times. Each iteration of inner loop will print one star (*).

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

C program to print triangle star pattern

C program to print right triangle star pattern


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 <= i; ++j) {
           printf("* ");
        /* move to next row */
    return 0;
Enter the number of rows
* *
* * *
* * * *
* * * * *
* * * * * *

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