c语言计算1-(1/2)+(1/3)-..+1/99-100的值

C语言计算1-1除2+1除3….+1除99-1除100
搜图云代码

# include <stdio.h>
int main(void)
{
	int i;
	double a, c;
	a = 1;
	i = 1;
	while (i <= 100)
	{
		if (i == 1 && a == 1)
			c = 1;
		else
			if (i % 2 == 0)
				c = c - (1 / a);
			else
				c = c + (1 / a);
		a = a + 1;
		i += 1;
	}
	printf("c=%lf \n", c);
	return 0;
}
结果：0.688172

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