Numerical Methods for Engineers(C-program code for Bisection Method for a perticular function)

#include<stdio.h>
#include<math.h>
float fu(float x)//defining a function
{
    float f;
    f = ((x*x*x)+(4*x*x)-10);
    return f;
}
int main()
{
    float xl,xu,xr,xi;
 xr =(xu+xl)/2;
printf("\nenter xl and xu\n");
    scanf("%f%f",&xl,&xu);
 if(fu(xu)*fu(xl)<0)
 {
while(fabs(fu(xr))>0.0001)   
{
    xr=((xl+xu)/2);
    if(fu(xr)*fu(xl)<0)
    {
        xu = xr;
    }
    else
    {
    xl=xr;   
    }
}
printf("\nroot of the equation is xr =%f\n\n",xr);
}
else
{
    printf("\nentered values are not correct\n");
}
}