About the quiz questions for this section of the chapter, I know they are meant to test my knowledge of the level of precedence logical AND and logical OR operators have when used in the same expression, but I can’t figure out how to “answer” them after Quiz Question #3.

I got the first two fine, but I get a little lost when the third one goes into “|| true == false”. I thought it would be “|| false == false” or “|| false == true”, not the other way around?

I know it seems like a trivial question, but I need to understand this.

primary

for optimization purposes.

Should be PRIMARILY :]

Thanks for a great tutorial, Alex!

Here’s the code:

int nInvoer=0;
do
	{
	cout << "Enter number (1 - 10): ";
	cin >> nInvoer;
	}
while (nInvoer < 1 && nInvoer >= 10 ); 

	// Do here if entered value is between 1 and 10.

Whatever value I enter, the program always goes to the next part. If I check either

nInvoer < 1 

or

nInvoer >=10

it works properly, but I can’t check both at the same time…

I just thought about your XOR question and came to this solution (since their is no XOR to use directly in c++)

(!america && russia) || (america && !russia)

lets just take a logic look behind this:

//example 1:
//america false, russia false
(!false && false) || (false && !false) == false || false == false

//example 2 & 3:
//america true, russia false (vice versa is the same result)
(!true && false) || (true && !false) == true || true == true

//example 4:
//america true, russia true
(!true && true) || (true && !true) == false || false == false

So basically with only 2 conditions it is easy to handle. How did you manage to pick that example?! :)

wish you all a nice weekend
Florian

America has nukes / Russia has nukes / World gets destroyed

false / false / false
true / false / true
false / true / true
true / true / false [MAD theory ;)]

Or is there a combination of ANDs and ORs and NOTs to achieve this?