Thread: unsigned data type?

When you declare a variable as unsinged it cann´t contain negative values. The advantage with declaring a variable as unsigned is that it can store larger values than signed.

E.i when you declara a varaiable as

Code:

unsigned char uc; //range from 0 - 255
signed char sc; // -126 to 127 (or something)

& is used when you want to declare a reference (an alias) to an object.

& also what are the #ifdef & ifndef compiler directives used for??

I think they are called inclusion gards. They are used so that e.i a class isn´t compiled twice (or more).

I think they are called inclusion gards. They are used so that e.i a class isn´t compiled twice (or more).

This is if you've included the same headerfile twice.

& is the refrence, you give it the address of a variable so you will be able to use it to access the variable, it's important when you call functions and pass an object to them, you use the refrence which prevent's making a copy of the objects, and saves momory.

Perica,

As you can see, you need to be careful when writing out your questions. You'll probably want to be more judicious with using the ampersand (&) rather than the word, "and", in the future. (You had me a little confused, too.)

-Skipper