#include<stdio.h>int main(){int n;int a,i;double sum;scanf("%d",&n);while(n--){sum=0;scanf("%d",&a);for(i=1;i<=a;i++){if(i%2==0){sum=sum-1.0/i;}else{sum=sum+1.0/i;}}printf("%.2lf\n",sum);}return 0;}
請(qǐng)教下多項(xiàng)式求和為啥這里要while（n--）？
桃花長(zhǎng)相依
2022-07-25 18:14:04
