Trust Coding : Programming: Develop a C program to draw a pattern of characters

Develop a C program to draw a pattern of characters like the one shown below:

             A
           B B
         C C C
       D D D D

Pattern Printing in C: Right-Aligned Alphabet Triangle

In this tutorial, we will develop a C program to print the following character pattern:

      A
    B   B
  C   C   C
D   D   D   D

Problem Analysis

Observe the pattern carefully:

Total rows = 4
Number of characters increases in each row
Spaces decrease in each row
Each row prints the same alphabet repeatedly

Row	Spaces	Characters Printed
1	3	A
2	2	B B
3	1	C C C
4	0	D D D D

C Program


#include <stdio.h>

int main() {
    int i, j;
    int n = 4;   // Total number of rows

    for(i = 1; i <= n; i++) {

        // Print leading spaces
        for(j = 1; j <= n - i; j++) {
            printf("  ");
        }

        // Print characters
        for(j = 1; j <= i; j++) {
            printf("%c ", 'A' + i - 1);
        }

        printf("\n");
    }

    return 0;
}

Explanation

1. Outer Loop (Rows)

The outer loop runs from 1 to 4 and controls the total number of rows.

2. First Inner Loop (Spaces)

This loop prints leading spaces before characters. The number of spaces is calculated as (n - i).

3. Second Inner Loop (Characters)

This loop prints characters equal to the row number.

4. Character Logic

The expression 'A' + i - 1 generates the required alphabet:

i = 1 → A
i = 2 → B
i = 3 → C
i = 4 → D

Output

      A
    B   B
  C   C   C
D   D   D   D

Time Complexity

The outer loop runs n times and the inner loops also run up to n times. So the overall time complexity is O(n²).

Trust Coding : Programming

Develop a C program to draw a pattern of characters