2-13.c

c实现的常用几个算法

#include<stdio.h>
#include<math.h>
#define EPS 1e-7
#define PI 3.14159
void main(void)
{ 
	int n; double x,an,sum;
	printf("input x: ");
	scanf("%lf",&x);
	x=x*PI/180; sum=0;
	an=x; n=1;
	do
	{ 
		sum+=an;
		++n;
		an*=(-x*x)/((2*n-2)*(2*n-1));
	}while(fabs(an)>=EPS);
	printf("sin(%.4f)=%.4f\n",x,sum);
}