View Code of Problem 71

#include<stdio.h>
int main()
{
	double fenzi=1.0,fenmu=1.0,fenshu,temp,sum=0.0;
	int n;
	scanf("%d",&n);
	while (n>0)
	{
		temp = fenzi;
		fenzi = fenzi + fenmu;
		fenmu = temp;
		fenshu =fenzi/fenmu;
		sum +=  fenshu;
		n--;
	}
	printf("%.2f",sum);
	return 0;
}

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