编辑代码

#include<stdio.h>
int main() {
    int i=30;
    int j,k,l;
    float sum,item;
    sum = 0;
    j=1;
    k=2;
    item = 0;
    while(i>0) {
        item = (float)j/k;
        sum = sum + item;
        l = j+k;
        j = k;
        k = l;
        i--;
    }
    printf("%.7f", sum);
}