Question

Chocolate bars are sold for $1 each. For every three chocolate wrappers you turn in, you receive $1 back. Implement a function iteratively which determines how many chocolate bars you can buy with x dollars.

Expected results from function call:

num_chocolatebars(0); //prints 0

num_chocolatebars(2); //prints 2

num_chocolatebars(3); //prints 4 (you spend 3 dollars on chocolate bars, you get three wrappers, then you receive one dollar back which you spend on another chocolate bar)

num_chocolatebars(5); //prints 5 + (5/3) (integer division) = 6

num_chocolatebars(9); //prints 9 + (9/3) + (9/3/3) = 13

Answer 1

#include <iostream>

using namespace std;

int num_chocolatebars(int amount)

{

int result = 0;

while(amount > 0)

{

result += amount; // counting the bars

amount = amount / 3; // giving back 1/3rd

}

return result;

}

int main() {

cout << num_chocolatebars(0) << endl; //prints 0

cout << num_chocolatebars(2) << endl; //prints 2

cout << num_chocolatebars(3) << endl; //prints 4 (you spend 3 dollars on chocolate bars, you get three wrappers, then you receive one dollar back which you spend on another chocolate bar)

cout << num_chocolatebars(5) << endl; //prints 5 + (5/3) (integer division) = 6

cout << num_chocolatebars(9) << endl; //prints 9 + (9/3) + (9/3/3) = 13

}