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 main()
{
	int n;
	while (scanf("%d", &n) != EOF && n != 0)
	{
		int f1=0, f2=1;
		int sum = 0;
		for (int i = 0; i < n; i++)
		{
			sum = f1 + f2;
			f1 = f2;
			f2 = sum;
		}
		printf("%d\n", sum);
	}
	return 0;
}

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