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Pattern 3

C++ Code Example — Pattern Programs

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Pattern 3

Objective

Write a C++ program to print a right half pyramid using alphabets.

Algorithm / Approach

  1. Use an outer loop i running from character 'A' to 'E'.
  2. Use an inner loop j running from 'A' up to i.
  3. Print the character j.
  4. Print a newline.
main.cpp 
#include<iostream>
using namespace std;
int main() {
for(char i = 'A'; i<='E'; i++) {
 for(char j = 'A'; j<=i; j++) {
  cout<< j;
 }
 cout<< endl;
}
return 0;
}

Expected Output

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 integers under the hood (ASCII values).
  • Because 'A' is 65 and 'E' is 69, you can literally use a for loop to iterate directly through the alphabet (i++) just like you would with normal numbers.

Complexity

Time Complexity O(n^2)
Space Complexity O(1)
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