Simple programming help for pass-by-reference and pass-by-value-result?

C++:

#include <iostream>

void inc_ref(int& n) // by reference

{

    ++n;

}

void inc_val(int n) // by value

{

    ++n;

}

int main()

{

    for (int var = 0; var < 10; inc_ref(var))

    {

        std::cout << var;

    }

}

If I had used inc_val inside the for loop parameters, it would cause an infinite loop and a runtime error because merely a copy of var would being incremented.

Pass By Value Result

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