Special alphabet pattern as per user request

Special Alphabet Pattern

This program is written for special request received from blogger "Sree". Thanks to Sree for referring this blog.

Following C program will print special alphabet pattern series.

For n=3, expected output is

A B C B A
  B C B
    C

For n=4, expected output is

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

#include<stdio.h>
int main() 
{
  int i, j, k, n;
  printf("Enter your number:");
  scanf("%d", &n);
  for (i=0; i<n; i++) 
  {
     //logic for intial spaces
     for(j=0; j<i; j++) 
          printf("  ");

     //printing first half in a row(eg for n=4; ABCD)
     for(k=65+i; k<65+n-1; k++)
           printf("%c ", k);
     //printing second half in a row(eg for n=4; CBA)

     for( ; k >=65+i; k--)
           printf("%c ", k);

     printf("\n");
  }
  return 0; 
}

Output of program

Enter your number:4

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

Read more Recommended Patterns Programs here.

C++ Program to calculate Area of Circle

/*
Following C++ program will calculate Area of Circle for the given radius.
*/

#include <iostream>
using namespace std;

int main()
{
    float radius, area;

    cout << "Enter the radius of circle : ";
    cin >> radius;
    
    area = 3.14 * radius * radius;
    
    cout << "Area of circle with radius "
         << radius << " is " << area;
}

Output of program

Enter the radius of circle : 2
Area of circle with radius 2 is 12.56