(using if, if-else, nested if, switch-case)

(using for, while, do-while loops)

C Programs

Share with a Friend

Print Half Pyramid (Right-Angled Triangle)

Introduction

A half pyramid (right-angled triangle) is one of the simplest and most common star patterns.
It consists of stars (*) increasing from one in the first row to n in the last row.

This program uses nested loops to print the right-angled triangle.

C Program: Print Half Pyramid (Right-Angled Triangle)

Method 1: Using for loop

#include <stdio.h>
 
int main() {
    int n, i, j;
 
    // Input number of rows
    printf("Enter number of rows: ");
    scanf("%d", &n);
 
    // Outer loop for rows
    for (i = 1; i <= n; i++) {
        // Inner loop for stars
        for (j = 1; j <= i; j++) {
            printf("*");
        }
        // Move to next line
        printf("\n");
    }
 
    return 0;
}

Output

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

Explanation

User enters the number of rows (n).
The outer for loop runs from 1 to n to control the rows.
The inner for loop prints stars (*) equal to the row number.
After each row, a newline (\n) moves the cursor to the next line.

C Program: Print Half Pyramid (Right-Angled Triangle)

Method 2: Using while loop

#include <stdio.h>
 
int main() {
    int n, i = 1, j;
 
    // Input number of rows
    printf("Enter number of rows: ");
    scanf("%d", &n);
 
    // Outer loop for rows
    while (i <= n) {
        j = 1;
 
        // Inner loop for stars
        while (j <= i) {
            printf("*");
            j++;
        }
 
        // Move to next line
        printf("\n");
 
        // Increment row
        i++;
    }
 
    return 0;
}

Output

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

Explanation

User enters the number of rows (n).
The outer for loop runs from 1 to n to control the rows.
The inner for loop prints stars (*) equal to the row number.
After each row, a newline (\n) moves the cursor to the next line.

C Program: Print Half Pyramid (Right-Angled Triangle)

Method 3: Using do..while loop

#include <stdio.h>
 
int main() {
    int n, i = 1, j;
 
    // Input number of rows
    printf("Enter number of rows: ");
    scanf("%d", &n);
 
    // Outer do...while loop for rows
    do {
        j = 1;
 
        // Inner do...while loop for stars
        do {
            printf("*");
            j++;
        } while (j <= i);
 
        // Move to next line
        printf("\n");
 
        i++; // Increment row
    } while (i <= n);
 
    return 0;
}

Output

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

Explanation

User enters the number of rows (n).
The outer for loop runs from 1 to n to control the rows.
The inner for loop prints stars (*) equal to the row number.
After each row, a newline (\n) moves the cursor to the next line.

Basics of C Programming (Introductory Programs)

Control Statements & Loops in C

Functions

Arrays

Strings

Pointers

Structures and Unions

Dynamic Memory Allocation

File Handling

Data Structures in C

Advanced C Programs

User-Defined Number Programs in C

User-Defined String Programs in C

C Programs

Share with a Friend

Loop Programs in C

Print Half Pyramid (Right-Angled Triangle)

Introduction

C Program: Print Half Pyramid (Right-Angled Triangle)

Method 1: Using for loop

Output

Explanation

C Program: Print Half Pyramid (Right-Angled Triangle)

Method 2: Using while loop

Output

Explanation

C Program: Print Half Pyramid (Right-Angled Triangle)

Method 3: Using do..while loop

Output

Explanation