#include <iostream>

void subRoutine(int input)
{
  std::cout << "Funktion Beginn: " << input << std::endl;
  input = 1;
  std::cout << "Funktion Ende: " << input << std::endl;
}

int main()
{
  int testValue = 0;
  std::cout << "Main Beginn: " << testValue << std::endl;
  subRoutine(testValue);
  std::cout << "Main Ende: " << testValue << std::endl;
  return 0;
}