lab3_5.cpp

来自「清华大学郑莉《C++语言程序设计》课件、C++教材源代码、实验参考程序全集」· C++ 代码 · 共 33 行

//lab3_5
#include <iostream>
using namespace std;

int fib(int n);

int main()
{
	int n, answer;
	cout << "Enter number: ";
	cin >> n;
	cout << "\n\n";
	
	answer = fib(n);
	cout << answer << " is the " << n << "th Fibonacci number\n";
	return 0;
}

int fib (int n)
{
	cout << "Processing fib(" << n << ")... ";
	if (n < 3 )
	{
		cout << "Return 1!\n";
		return (1);
	}
	else
	{
		cout << "Call fib(" << n-2 << ") and fib(" << n-1 << ").\n";
		return( fib(n-2) + fib(n-1));
	} 
}