View Code of Problem 23

#define _CRT_SECURE_NO_DEPRECATE
#define _CRT_SECURE_NO_WARNINGS
#pragma warning(disable:4996)；
#include <stdio.h>
#include <string.h>
#include <math.h>
#define N 100000
//X[n+1]=1/2(X[n]+a/X[n])
int F(int n)
{
	if (n == 0)
		return 0;
	if (n == 1)
		return 1;
	return F(n - 2) + F(n - 1);
}

int main()
{
	int n;
	while (scanf("%d", &n) != EOF && n != 0)
	{
		printf("%d\n", F(n+1));
	}
	return 0;
}