int s=1;
double n=1;t=1;sum=0;
while(n<=100)
{
sum=sum+t;
n++;
s=-s;
t=s/n;
}
#include"stdio.h"
int main(void)
{
int n=100;
int i;
float sum=0;
for(i=1;i<=n;i++){
sum+=(1.0/i);
}
printf("%f",sum);
return 0;
}
public static void main(String args[]){
//第一种
double sum=0,n=1;
for(double i=1;i<=100;i++){
sum+=(1/i)*n;
n*=-1;;
}
//第二种
double i=1;
sum=0;n=1;
while(i<=100){
sum+=(1/i)*n;
n*=-1;;
}
}
