鲍骞月

[baoqianyue]

输出数列前20项的和

#include <stdio.h>
int main()
{
    double sum,a;
    int i,j;
    int j1 = 1,j2 = 2,j3; 
    for(i = 1;i <= 20;i++)
    {
    	
    	a = (double)j2 / (double)j1;
    	sum = a + sum;
    	j3 = j1 + j2;
    	j1 = j2;
    	j2 = j3;
    	
    	
    } 
       printf("%lf\n",sum);
	    return 0;
    
 } 
 

[Feng-YuanQing]

。。。hello