Question

用C语言编写“2/1,3/2,5/3,8/5....求出这个数列前10项的和“

Answer 1

#include<iostream>
#include<string>
#define N 3
using namespace std;
int main()
{
int a=1,b=2,c,n;
double sum=0;
for(c=0;c!=3;++c)
{sum+=(double)b/a;
n=b;
b=a+b;
a=n;
}
cout<<sum<<endl;
}

Answer 2

int i = 1;
int j = 2;
int k = 0;
int sum = 0;
while (k < 10)
{
sum += j / i;
int t = j;
j = i + j;
i = t;
k++;
}

Answer 3

#include<stdio.h>
main()
{
int i=2,j=1,t,k;
double sum=0;
for(t=0;t<10;t++)
{
sum += 1.0*i/j;
k=i;
i=i+j;
j=k;
}
printf("sum = %lf",sum);
}
满意请采纳！