#include <stdio.h>
#include <math.h>

float dix(float, float, float, float(*)(float));
float f(float);
main();
{
    float x,a,eps;
    printf("\n zadayite granitsi intervala and tochnost:");
    scanf("%f%f%f", &a,&b,&eps);
    x=dix(a,b,eps,f);
    printf("\n x=3.2f\n F=%f",x,f(x));
    getch();
}

float dix(float a,float b,float eps,float (*v)(float))
{
    float x,z;
    z=v(a);
    do {
        x=tan(x);
        if(v(x)==0) return x;
        if(z*v(x)>0)
            a=x;
        else
            b=x;
       } while((b-a)>eps);
    return .5*(a+b);
}
float f(float x)
{
return x*x*x+2*x-10;
}