快救救孩子吧。我真的看了好久

Question

Answer 1

#include "stdio.h"
#include "math.h"
void main()
{
    int x;
    double sum=0;
    int i;
    scanf("%d",&x);
    
    for(i=1;i<=100;i++){
        sum += pow(-1,i-1)*x/i;    
    }
    printf("sum=%0.2lf",sum);
}