【思路待补充】【每日一练】12.2计算sin(x)

问题描述

输入样例 3.142

输出样例 -0.000407347

//12.02-2 计算sin(x)
#include <stdio.h>
#include <math.h> 
double sin(double);
double nResult(double,double);
int main()
{
	double x=0;
	scanf("%lf",&x);
	printf("sin(%lf)=%lf\n",x,sin(x));
	return 0;	
}
double sin(double x)
{
	int i=0;
	double result=0,n=0;
	while(fabs(n=nResult(x,2*++i-1)) >=pow(10,-7))
	    result+=(i%2==1)?n:-n;
	return result;
}
double nResult(double x,double n)
{
	return n==1?x:nResult(x,n-1)*x/n;
}

疑问
sin(x)