JuniorTheoryCommon

What happens when this program is compiled and run?

Console.WriteLine(Abs(-7) + " " + Abs(7));

int Abs(int n)
{
    if (n < 0)
    {
        return -n;
    }
}

It does not compile

Expecting 7 0: a method does not return 0 on its own; the compiler requires a return on every path and stops the build with CS0161.
Expecting a failure only when Abs(7) runs: the compiler checks every path of the method before the program starts, so nothing is printed.

JuniorTheoryCommon

Console.WriteLine(Abs(-7) + " " + Abs(7));

int Abs(int n)
{
    if (n < 0)
    {
        return -n;
    }
}

It does not compile

Expecting 7 0: a method does not return 0 on its own; the compiler requires a return on every path and stops the build with CS0161.
Expecting a failure only when Abs(7) runs: the compiler checks every path of the method before the program starts, so nothing is printed.