#include <iostream>
#include <math.h>
#include <stdlib.h>
using namespace std;
 
const double eps = 0.01;
double a, b, t, x, y, t1, s;
 
double func(double a, double b, double e=0)
{
    s = (a + b) / 2;
    y = 7 * sin(2*(s+e));
    return y;
}
 
void JustDoIt(double &a,double &b)
{
            t = (a + b) / 2.0;
            y = func(a, b,  - eps);
            x = func(a, b,  eps);
            if (y <= x)    a = t;
            else   b = t;
            // чек-блок 
                 cout << "t= " << t <<"\n";
                 cout << "a= " << a <<" b=" << b <<"\n";
                 cout << "x= " << x <<" y=" << y <<"\n";
                 cout << "fabs(b - a)= " <<  fabs(b - a) <<"\n";
            // 
           if ( fabs(b - a) < eps) return;
            JustDoIt( a, b);
}
 
int main()
{
   a = 2;
   b = 6;
   JustDoIt( a, b);
   cout << "Otvet: " << func(a, b);
    return 0;
}

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