Question

in the example below, what would ‘foo’ be set to each time? I’ve searched online but I can’t find anywhere that gives me the answer:

static void Main(string[] args) {
   static public bool abc = true;
   static public bool foo = (abc = false);
   foo = (abc = true);
}

Answer 1

false the first time and true the second time. Remember that = is the assignment operator: it assigns the value of the second operand to the first, and then returns this value. For example:

int foo = 1;
int bar = (foo = 2);

The second line here assigns the 2 to foo, then returns 2 to the other assignment operator, which assigns 2 to bar. At the end of it all, both foo and bar have the value 2.

Edit: This is why it’s valid to chain up assignment operations; e.g.

int foo;
int bar;
foo = bar = 2; // Equivalent to foo = (bar = 2);