C Programs

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Loop Programs in C

Print Number Pyramid Pattern

Introduction

A Number Pyramid Pattern is similar to the star pyramid, but instead of stars (*), we print numbers.
Each row contains numbers from 1 up to the row number, arranged in a centered format.

For example, for n = 5:

                                  1

                               1    2

                             1   2    3

                            1  2   3   4

                          1  2   3   4   5

This program demonstrates nested loops, pattern alignment, and number printing in a triangular format.

C Program: Print Number Pyramid Pattern

Method 1: Using for loop

#include <stdio.h>
 
int main() {
    int n;
    printf("Enter number of rows: ");
    scanf("%d", &n);
 
    for (int i = 1; i <= n; i++) {
        // Print leading spaces
        for (int j = i; j < n; j++) {
            printf(" ");
        }
 
        // Print numbers
        for (int k = 1; k <= i; k++) {
            printf("%d ", k);
        }
 
        printf("\n");
    }
 
    return 0;
}

 
OUTPUT :
Enter number of rows: 5
    1
   1 2
  1 2 3
 1 2 3 4
1 2 3 4 5

Explanation

1. The outer loop controls the rows.
2. The first inner loop prints spaces for alignment.
3. The second inner loop prints numbers from 1 to i.
4. Each row increases by one number.

C Program: Print Number Pyramid Pattern

Method 2: Using while loop

#include <stdio.h>
 
int main() {
    int n, i = 1, j, k;
    printf("Enter number of rows: ");
    scanf("%d", &n);
 
    while (i <= n) {
        j = i;
        while (j < n) {
            printf(" ");
            j++;
        }
 
        k = 1;
        while (k <= i) {
            printf("%d ", k);
            k++;
        }
 
        printf("\n");
        i++;
    }
 
    return 0;
}

 
OUTPUT :
Enter number of rows: 5
    1
   1 2
  1 2 3
 1 2 3 4
1 2 3 4 5

Explanation

1. The outer loop controls the rows.
2. The first inner loop prints spaces for alignment.
3. The second inner loop prints numbers from 1 to i.
4. Each row increases by one number.

C Program: Print Number Pyramid Pattern

Method 3: Using do..while loop

#include <stdio.h>
 
int main() {
    int n, i = 1, j, k;
    printf("Enter number of rows: ");
    scanf("%d", &n);
 
    do {
        j = i;
        do {
            if (j < n)
                printf(" ");
            j++;
        } while (j <= n);
 
        k = 1;
        do {
            if (k <= i)
                printf("%d ", k);
            k++;
        } while (k <= i);
 
        printf("\n");
        i++;
    } while (i <= n);
 
    return 0;
}

 
OUTPUT :
Enter number of rows: 5
    1
   1 2
  1 2 3
 1 2 3 4
1 2 3 4 5

Explanation

1. The outer loop controls the rows.
2. The first inner loop prints spaces for alignment.
3. The second inner loop prints numbers from 1 to i.
4. Each row increases by one number.