1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100的值

#include <stdio.h>
int main()
{
int m=1;
double sum=1.0,n=2.0,x=0.0;
while(n<=100)
{
m=-m;
x=m/n;
sum=sum+x;
n=n+1;
}
printf("%f\n",sum);


return 0;
}