C语言，请各位大神答答题

Question

 

Answer 1

代码如下

#include <stdio.h>
#include <math.h>
void main()
{
	float sum,t,s=1,n=0;
	sum =0.0, t =1;
	while( fabs(t) >= 0.00001  )
	{
		sum = sum + t;
		n = n +1;
		s = -s;
		t = s / (2.0*n);
	}
}