求1-1/2+1/3-1/4+...+1/99-1/100的结果

#include<stdio.h>
void main()
{ 
	int sign=1; 
	float deno=2.0,sum=1.0,term; 
	while(deno<=100) 
	{  
		sign=-sign;  
		term=sign/deno;  
		sum=sum+term;  
		deno=deno+1; 
	} 
	printf("%f\n",sum);
}