max i min

#include <iostream>
using namespace std;
 
double min(double &x,double &y)
{
if (x>y)
return y;
else
return x;
}
 
double max(double &x,double &y)
{
if (x>y)
return x;
else
return y;
}
 
int main()
{
double p,x,y,z;
cout<<"Please enter x,y,z\n";
cin>>x>>y>>z;
p=(min(x,y)-max(y,z))/2;
cout<<"p = "<<p<<endl;
cout<<"9 ne 4itau knig i ne xo4y"
"y4it's9, poetomy zada4i rewaut za men9";
return 0;
}

return x > y ? y : x;

#include <iostream>
#include <algorithm>
#include <cmath>
 
double foo(const int x, const int y, const int z)
{
    return abs(std::min(x, y) - std::max(y, z)) / 2.0;
}
 
int main()
{
    int x, y, z;
    std::cin >> x >> y >> z;
    double p = foo(x, y, z);
    std::cout << p;
}

#include <iostream.h>

#include <iostream>
#include <algorithm>
#include <cmath>
 
double foo(const int x, const int y, const int z)
{
    return abs(std::min(x, y) - std::max(y, z)) / 2; // int / int
}
 
int main()
{
    int x, y, z;
    std::cin >> x >> y >> z;
    double p = foo(x, y, z);
    std::cout << p;
}

double foo(double x, double y, double z)
{
    return std::abs(std::min(x, y) - std::max(y, z)) / 2; // double / int
    return ::abs(std::min(x, y) - std::max(y, z)) / 2; // int / int
}