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Beginner C/C++ Exercises

Fibonacci Sequence

Generate the first ten Fibonacci numbers.

What is Fibonacci Sequence?

Each Fibonacci number is the sum of the two values before it.

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

C
Run code →
main.c
#include <stdio.h>
int main(void) {
    int first = 0, second = 1;
    for (int i = 0; i < 10; ++i) {
        printf("%s%d", i ? " " : "", first);
        // Advance the pair without storing the whole sequence.
        int next = first + second; first = second; second = next;
    }
    puts("");
}
Result of running the code
0 1 1 2 3 5 8 13 21 34
C++
Run code →
main.cpp
#include <iostream>
int main() {
    int first = 0, second = 1;
    for (int i = 0; i < 10; ++i) {
        if (i) std::cout << ' ';
        std::cout << first;
        // Advance the pair without storing the whole sequence.
        int next = first + second; first = second; second = next;
    }
    std::cout << '\n';
}
Result of running the code
0 1 1 2 3 5 8 13 21 34

C and C++ comparison

Two state variables are sufficient because each iteration only needs the previous pair.

C

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.

Practice with a challenge

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