Beginner C/C++ Exercises

FizzBuzz

FizzBuzz combines a loop, divisibility tests, and ordered conditions.

What is FizzBuzz?

FizzBuzz combines a loop, divisibility tests, and ordered conditions.

Print Fizz, Buzz, or FizzBuzz for numbers from 1 through 15.

Important points

Compile with warnings enabled and fix every warning.
Know the lifetime and type of every value.
Validate input and keep array bounds explicit.

C and C++ code examples

Run code →

main.c

#include <stdio.h>
int main(void) {
    for (int n = 1; n <= 15; ++n) {
        // Check the most specific condition first.
        if (n % 15 == 0) puts("FizzBuzz");
        else if (n % 3 == 0) puts("Fizz");
        else if (n % 5 == 0) puts("Buzz");
        else printf("%d\n", n);
    }
}

Expected output

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz

C++

Run code →

main.cpp

#include <iostream>
int main() {
    for (int n = 1; n <= 15; ++n) {
        // Check the most specific condition first.
        if (n % 15 == 0) std::cout << "FizzBuzz\n";
        else if (n % 3 == 0) std::cout << "Fizz\n";
        else if (n % 5 == 0) std::cout << "Buzz\n";
        else std::cout << n << '\n';
    }
}

Expected output

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz

C and C++ comparison

Test divisibility by both 3 and 5 first so multiples of 15 are not handled by an earlier branch.

C exposes small procedural APIs and makes representation details explicit.

C++

C++ retains the low-level model while adding safer library types and abstractions.

Practice exercises

Run both versions, then modify them to observe the different language guarantees.

Add invalid and boundary-value inputs.
Compile with -Wall -Wextra -Wpedantic.
Move reusable declarations into a header and implementation file.