计算 sin(x)=x - x3/3!+ x5/5!- x7/7!+ ……直到最后一项的绝对值小于10-7.

#include
#include
int main(int argc,char* argv[])
{
double x=0.8;
double sinx=x;
double k=-1;
double n=1;
double i=1;
double xx=x;
double y;
do
{
xx *= x*x;
n *=(i+1)*(i+2);
y= xx /n;
sinx += k*y;
k = -k;
i+=2;
}while( y > 10e-7);
printf("sinx =%fnsin(x)=%fnsinx-sin(x)=%fn",sinx,sin(x),sinx-sin(x));
return 0;
}