Here is a small program to clalculate Fibonacci numbers using c++ language. No tampering with the code needed ( only iprovements ! ) just copy and compile with g++ FibonacciNumber.cpp -o FibonacciNumber and run ./FibonacciNumber

#include <iostream> #include <cstdlib> void HowMany(int *numbers); void CalculateFibonacci(int *numbers); int main() { int numbers = 0; HowMany(&numbers); CalculateFibonacci(&numbers); return 0; } void HowMany(int *numbers) { // use pointers as parameter, not references std::cout << "How many Fibonacci numbers would you like to calculate? "; std::cin >> *numbers; if ((!std::cin.good()) || ( *numbers <= 1 || ( *numbers >= 48 ))) { printf("Invalid number entered ! I calculate only more than 0 or less then 48 Fibonacci numbers !! \n"); exit(1); } } void CalculateFibonacci(int *numbers) { int i = 0; unsigned long a = 1; unsigned long b = 0; unsigned long fibonacci_number = 0; while(i < *numbers) { b= fibonacci_number; fibonacci_number = a + b; std::cout << "Fibonacci number: " << i+1 << ". " << fibonacci_number << "\n"; a = b; i++; } std::cout << std::endl; }

**OUTPUT:**

./FibonacciNumber

How many Fibonacci numbers would you like to calculate? 30

Fibonacci number: 1. 1

Fibonacci number: 2. 1

Fibonacci number: 3. 2

Fibonacci number: 4. 3

Fibonacci number: 5. 5

Fibonacci number: 6. 8

Fibonacci number: 7. 13

Fibonacci number: 8. 21

Fibonacci number: 9. 34

Fibonacci number: 10. 55

Fibonacci number: 11. 89

Fibonacci number: 12. 144

Fibonacci number: 13. 233

Fibonacci number: 14. 377

Fibonacci number: 15. 610

Fibonacci number: 16. 987

Fibonacci number: 17. 1597

Fibonacci number: 18. 2584

Fibonacci number: 19. 4181

Fibonacci number: 20. 6765

Fibonacci number: 21. 10946

Fibonacci number: 22. 17711

Fibonacci number: 23. 28657

Fibonacci number: 24. 46368

Fibonacci number: 25. 75025

Fibonacci number: 26. 121393

Fibonacci number: 27. 196418

Fibonacci number: 28. 317811

Fibonacci number: 29. 514229

Fibonacci number: 30. 832040