X274: Recursion Programming Exercise: Cannonballs Spherical objects, such as cannonballs, can be stacked to form a pyramid with one cannonball at the top, sitting on top of a square composed of four cannonballs, sitting on top of a square composed of nine cannonballs, and so forth. RequireD:
Write a recursive function that takes as its argument the height of a pyramid of cannonballs and returns the number of cannonballs it contains.

The function in C is as follows:

#include <stdio.h>

int C_ball(int height){

if(height == 1) {

       return 1;}

   return (height * height) + C_ball(height - 1);}      

int main(){

   int n;

   printf("Height: ");

   scanf("%d",&n);

   printf("Balls: %d",C_ball(n));

   return 0;

}

Explanation:

The function begins here

#include <stdio.h>

This defines the function

int C_ball(int height){

If height is 1, return 1

if(height == 1) {

       return 1;}  

This calls the function recursively

   return (height * height) + C_ball(height - 1);}

The main begins here

int main(){

This declares the height as integer

   int n;

This prompts the user for the height

   printf("Height: ");

   scanf("%d",&n);

This calls the function

   printf("Balls: %d",C_ball(n));

   return 0;

}

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