две задачки

void func(int& a, int& b)
{
  int& min_ = (a < b) ? a : b;
  int& max_ = (a < b) ? b : a;
  min_ = abs(a - b);
  max_ = abs(a * b);
}

#include<iostream>
using namespace std;
int main ()
{
   int a;
   cout << "Enter numbers" << endl;
   cin >> a;
   if(a%2==0)cout << "even" << endl;
   cout << "odd" << endl;
   system("pause");
}

#include<iostream>
#include<math.h>
using namespace std;
int main ()
{
   int a,b;
   cout << "Enter first numbers" << endl;
   cin >> a ;
   cout << "Enter second numbers" << endl;
   cin >> b;
   if(a>=b)cout << abs(a*b) << endl;
   cout << abs(a-b) << endl;
   system("pause");
}

#include <iostream>
#include <conio.h>
using namespace std;
 
bool isOdditive(int val)
{
    return (val % 2 == 0);
}
 
int main()
{
    int a,b,buf;
    do
    {
        std::cout<<"Enter a :";std::cin>>a;
        std::cout<<"Enter b :";std::cin>>b;
        std::cout<<"a - ";
        if(!isOdditive(a))
            "not ";
        std::cout<<"odditive\r\n";
        std::cout<<"b - ";
        if(!isOdditive(b))
            "not ";
        std::cout<<"odditive\r\n";
        buf = abs(a*b);
        if(a < b)
        {
            std::cout<<"a < b\r\n";
            std::cout<<"a = "<<(a = abs(a - b))<<"\r\n";
            std::cout<<"b = "<<(b = buf)<<"\r\n";
        }
        else
        {
            std::cout<<"b < a\r\n";
            std::cout<<"a = "<<(a = buf)<<"\r\n";
            std::cout<<"b = "<<(b = abs(a - b))<<"\r\n";
        } 
        std::cout<<"Press Y for new input\r\n";
    }
    while(toupper(getch()) == 'Y');
    return 0;
}

int min_ = (a < b) ? a : b;

void func(int& a, int& b)
{
  int min_ = abs(a - b);
  int max_ = abs(a * b);
  a = min_;
  b = max_;
}