Need help understading expression.

[rutski76]

Hi everyone,

I'm new to both C++ and these forums. I'm reading up on the language but can't seem to get this expression wrapped around my head.

expression:

((total % 3) == 2)

From what I can figure, if my variable (total) divided by 3 is equal to 2 then the expression is true correct?

But for example I enter 11 as the variable, which is not divisible by 3, statement still comes out true.

Thanks,

[zb0S216C]

rutski76 wrote:

From what I can figure, if my variable (total) divided by 3 is equal to 2 then the expression is true correct?

In C/C++, the percentage is modulus. With the modulus operator, the remainder of a division is its return value. That said, if the remainder of the division is equal to 2, then the expression is true. Otherwise, it's false.

_Wazzak

[rutski76]

Sorry,

I'm still not fully understanding. Using the above example; 11 / 3 = 3.6~ how is that equal to 2?

[zb0S216C]

The modulus operator returns the remainder of a division, not the amount of times the left-hand operand went into the right-hand operand (an operand is a piece of data on either side of an operator). For instance, 11 / 3 is two. Here's why:

11 - 3 = 8
8 - 3 = 5
5 - 3 = 2
2 - 3 = ??

The last calculation can't be done because 3 is greater. Because we can no longer divide 2 by 3, 2 becomes the remainder.

_Wazzak

[vin]

The % is the modulus operator that gives the remainder of a division.

11 divided by 3 gives 3 remainder 2. (i.e. (3 x 3)+2 = 11)

% returns the 2.

[rutski76]

Nice!

I totally get it now!!!

Thanks!