// 试试看
#include "stdio.h"
int main()
{
double x = 1, y = 1, z = 2;
double sum = 0;
int n;
int i = 0;
scanf("%d", &n);
while(i++ < n){
sum += z / y;
x = y;
y = z;
z = x + y;
}
printf("%.2f\n", sum);
return 0;
}
#include
void main()
{ int fz,fm,k,n,i;
double sum;
sum=0; fz=2; fm=1;
scanf("%d",&n);
for ( i=0;i
}
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