Creating FizzBuzz in C++

FizzBuzz is a word game used to teach young school children about division. The students sit in a circle, and take turns counting, one number each.

Any number that is divisible by 3 is replaced with the word "Fizz"; numbers divisible by 5 are replaced with "Buzz", and numbers divisible by 15 are replaced with "FizzBuzz".

The sequence looks like this:

1, 2, Fizz, 4, Buzz, Fizz, 7, 8, Fizz, Buzz, 11, Fizz, 13, 14, Fizz Buzz, 16, 17...

This game, and variants of it, gained popularity within the programming community.

This is because implementing a program that can "solve" FizzBuzz requires a solid foundation in programming. It uses variables, operators, loops, conditional statements and functions.

It is a useful milestone to ensure we understand all these basic principles. For this reason, candidates applying to programming jobs are sometimes asked to implement FizzBuzz in their interview.

The Challenge

Our challenge is to do this in C++! We've learnt all we need to implement FizzBuzz at this point. Using loops, functions, conditionals and the modulus operator, we need to:

• Write a program that logs out the numbers from 1 to 100.
• Each number should appear in its own line
• Numbers divisible by 3 are replaced with Fizz
• Numbers divisible by 5 are replaced with Buzz
• Numbers divisible by 15 are replaced with FizzBuzz
• This should not require more than 30 lines of code

The output should look something like the following. I've omitted 17-97 for brevity, but the pattern coninues in that range:

11
22
3Fizz
44
5Buzz
6Fizz
77
88
9Fizz
10Buzz
1111
12Fizz
1313
1414
15FizzBuzz
1616
17  pattern continues until...
1898
19Fizz
20Buzz
21

Starting Point

Use the following code as a starting point:

1#include <iostream>
2using namespace std;
3
4int main() {
5
6}
7

Hints

A series of hints, culminating in a full solution, are included with challenges. However, I'd recommend trying the challenges yourself before looking at the hints. All the tools needed to complete a challenge were provided in the proceeding lessons.

Additionally, if you get stuck, rather than looking at a hint, considering searching the internet for assistance first. This is a very common practice even in professional programming.

When getting help on the internet, you are likely to find code you don't understand. I'd caution against just copying and pasting in code. Even if it ends up working, you haven't really learnt anything if you don't understand why it is working.

The bigger goal is not to create FizzBuzz - it is to learn how to program, so you can create whatever you want eventually.

1#include <iostream>
2using namespace std;
3
4void Log(int Number) {
5  // If Number is divisible by 15, log out FizzBuzz
6  // Else If Number is divisible by 5, log out Buzz
7  // Else If Number is divisible by 3, log out Fizz
8  // Else, log out the number
9  // Log out an endl
10}
11
12int main() {
13  // Call Log 100 times, with the numbers from 1 to 100
14}
15

1#include <iostream>
2using namespace std;
3
4void Log(int Number) {
5  // If Number is divisible by 15, log out FizzBuzz
6  if (Number % 15 == 0) {
7    cout << "FizzBuzz";
8  }
9  // else if Number is divisible by 5, log out Buzz
10  // else if Number is divisible by 3, log out Fizz
11  // else, log out the number
12  // Log out an endl
13}
14
15int main() {
16  // Using a loop, eg a while loop, call Log 100 times
17  // with the numbers from 1 to 30
18}
19

1#include <iostream>
2using namespace std;
3
4void Log(int Number) {
5  if (Number % 15 == 0) {
6    cout << "FizzBuzz";
7  } else if (Number % 5 == 0) {
8    cout << "Buzz";
9  } else if (/* TODO: Check if number divisible by 3 */) {
10    cout << "Fizz";
11  } else {
12    // TODO: Log out the number
13  }
14  // TODO: log out an endl
15}
16
17int main() {
18  int LoopIteration { 1 };
19  while (/* TODO: boolean expression to loop 100 times */) {
20    LoopIteration++
21    // TODO: call Log function
22  }
23}
24

1#include <iostream>
2using namespace std;
3
4void Log(int Number) {
5  if (Number % 15 == 0) {
6    cout << "FizzBuzz";
7  } else if (Number % 5 == 0) {
8    cout << "Buzz";
9  } else if (Number % 3 == 0) {
10    cout << "Fizz";
11  } else {
12    cout << Number;
13  }
14  cout << endl;
15}
16
17int main() {
18  int LoopIteration { 1 };
19  while (LoopIteration <= 100) {
20    Log(LoopIteration);
21    LoopIteration++;
22  }
23}
24