Объявление переменных

#include <stdio.h>
#include <iostream>
int main()
{
    using std::cout;
    //инициализировать две целочисленные переменные
    int myAge = 39;
    int yourAge = 39;
    cout << "I am: " << myAge << " years old.\n";
    cout << "You are: " << yourAge << " years old\n";
    myAge++;      //постфиксный инкремент
    ++yourAge;   //префиксный инкремент
    cout << "One year passes...\n";
    cout << "I am: " << myAge << " years old.\n";
    cout << "You are: " << yourAge << "years old\n";
    cout << "Another year passes.\n";
    cout << "I am: " << myAge++ << " years old.\n";
    cout << "You are: " << ++yourAge << "years old\n";
    cout << "Let`s print it again.\n";
    cout << "I am: " << myAge << " ears old.\n";
    cout << "You are: " << yourAge << " years old\n";
    return 0;
}

    myAge++;      //постфиксный инкремент
    ++yourAge;   //префиксный инкремент

    myAge++;      //постфиксный инкремент
    ++yourAge;   //префиксный инкремент

 cout << "I am: " << myAge++ << " years old.\n";
    cout << "You are: " << yourAge++ << "years old\n";

cout << "I am: " << ++myAge << " years old.\n";
    cout << "You are: " << ++yourAge << "years old\n";