Program to find the value of sin x series in C

#include
#include
#include

int main(void)
{
    float x1,x2,y1,y2,x,y,e;
    x1=2.0;
    x2=4.0;
    y1=sin(x1)-x1+1;
    y2=sin(x2)-x2+1;
    e=(x1-x2)/x1;
    if(e<0)
    e=-e;
    do
    {
         x=(x1+x2)/2;
         y=sin(x)-x+1;
         if(y*y1<0)
         {
                   x=x2;
                   y=y2;
                   }
                   else
                   {
                       x=x1;
                       y=y1;
                       }
                       }while(e<0.00001);
                       printf("\n The root is %f",x);
                       getch();
                       return 0;
                       }