C Program to print Pattern 3 A A B A B C A B C D A B C D E

Write a C program to print a left-aligned right triangle of Characters.

Run an outer loop using character variables: i = 'A' to 'E'.
Run an inner loop: j = 'A' to i.
Inside the inner loop, print the current character j using the %c format specifier.
Print a newline.

main.c

#include<stdio.h>
int main( ) {
 char i,j;
 for(i='A';i<='E';i++) {
  for(j='A';j<=i;j++) {
   printf("%c ",j);
  }
  printf("\n");
 }
 return 0;
}

A
A B
A B C
A B C D
A B C D E

Explanation of the Program

In C, characters (char) are actually just small integers under the hood, representing their ASCII values (e.g., 'A' is 65).
Because they are integers, you can use them directly in for loops! The loop will iterate from 65 to 69, printing the corresponding letters perfectly.

Time Complexity O(n^2)

Space Complexity O(1)