#include<stdio.h>
int main()
{
	double item, sum = 0;
	int i, sign = 1;
	double m = 2, n = 1;
	for (i = 1; i <= 1000; i++)//迴圈i從1到1000
	{
		item = sign * m*1.0 / n;//計算每一項
		sign = -sign;//改變每一項的正負
		m = m + n;//計算分子
		n = m - n;//計算分母
		sum += item;//求和
	}
	printf("sum=%f\n", sum);//輸出和
	return 0;
}
 

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