C++第十四题20150408

#include<stdio.h>
int main()
{
int i,n;
float a,b,c,d,e,f;
a = 2;
b = 1;
i = 1;
d = 0;
printf("请输入一个n:");
scanf("%d",&n);
while(i<=n)
{
c = a/b;
d = c + d;
e = a + b;
f = a;
a = e;
b = f;
i++;
}
printf("输出前n项和为%6.2f",d);
return 0;
}