c – 错误顺序的函数调用

#include <iostream>
using namespace std;

int function1()
{
  cout<<"Hello from function1()"; return 0;
}

int function2()
{
  cout<<"Hello from function2()"; return 0;
}

int main()
{
    int func_diffresult = 0;
    func_diffresult = function1() - function2();
    cout<<func_diffresult; /** prints 0 correctly **/
}

输出是来自function1()的function2()Hello的Hello.我认为输出应该是来自function2()的function1()Hello的Hello.我的编译器和我一起玩吗？