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

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