difference between variables and constants.

[Cyber dorkz]

i have readed the guid.l and now i'm ready for some action.

what is a constant? i've readed in a manual what it is but i dont understand.
is that a number or something?
what is the difference between variables and constants?


thank you.

[JosAH]

i have readed the guid.l and now i'm ready for some action.

what is a constant? i've readed in a manual what it is but i dont understand.
is that a number or something?
what is the difference between variables and constants?


thank you.

Oh please. What do those very names suggest? A constant is a value that
can not be changed. A variable can change values.

kind regards,

Jos

[Cyber dorkz]

can you please give somthing for example; a constant, cause i see that a constant is a number and it beggins with 0X (16 numbers) , 0(8 numbers), and ends with F, L, U.

actually , a constant is very difficul to understand cause of all that ^^^^^^




thanks for answering, i repete again: i've readed the guidl.

[Cyber dorkz]

oops, i forgotn something to say, you said to me that a variable can change, but a constant not, what do you mean with changing?; please give a program for example that we can change and we cannot change.

[sicarie]

oops, i forgotn something to say, you said to me that a variable can change, but a constant not, what do you mean with changing?; please give a program for example that we can change and we cannot change.

These are really basic questions - things that aren't really in the scope of this site. Read a tutorial, take a class. If you're having issues with these types of things, we're not going to be able to do much to help you.

http://www.cplusplus.com/doc/tutorial/

Go through that. Play with ALL the examples. Look up the functions. Play with the examples they give. Then come back and ask questions.

[Cyber dorkz]

thanks , but to be honest , i do know how templa.te classes works.

[sicarie]

thanks , but to be honest , i do know how templa.te classes works.

You know how template classes work, but you don't know the difference between a var and a const?

[Banfa]

can you please give somthing for example; a constant, cause i see that a constant is a number and it beggins with 0X (16 numbers) , 0(8 numbers), and ends with F, L, U.

actually , a constant is very difficul to understand cause of all that ^^^^^^

You are confusing constants and literals (sorry I may have added to this confusion with an earlier post). A constant is actually a type modifier on a variable that indicates the value of the variable doesn't change.

A literal is were you type a value directly into your code for instance 5 is an integer literal.

[code=cpp]
int main(int argc, char **argp)
{
int i1; // This is an integer variable
101; // This is an integer literal

const int i2 = 100; // This is an integer constant initialised by an integer literal

i1 = 200; // This is OK

i2 = 300; // This is NOT OK and causes a compiler error because i2
// is declared constant and there for can not be changed

return 0;
}
[/code]

[Banfa]

You know how template classes work, but you don't know the difference between a var and a const?

and that's the beauty of C++ you can learn the complex stuff while completely by-passing the basics :D

[JosAH]

and that's the beauty of C++ you can learn the complex stuff while completely by-passing the basics :D

Isn't that how most of the programming community operates nowadays? Build
on top of things you don't understand but just deliver. What a great scientific exercise.

kind regards,

Jos ;-)

[Cyber dorkz]

i'll give a simple example of variable that can change and a constant that cannot change; ( must be good, if it isn't say it to me)

[code=c]
#include < iostream >

int main()
{
int number = 5 ;
cin.get() ;

number = number + 1 ; // you can do also this number++
cin.get() ;
}
[/code]

that was a variable , it can change!


here is a constant :

WAIT : constant can't change!

is everything good what i just said????

[Cyber dorkz]

please answer!


i need to be professional, cause i am , haha
but just please answer.


thanks


kind regards ,


dorkz

[Cyber dorkz]

hello?
can someone whos very nice answer?

[TRScheel]

hello?
can someone whos very nice answer?

Amigo, they have answered your question, even going above and beyond to explain literals. I don't know what more you want.

Constant = Cannot change / Bad practice to even attempt to
Variable = Changes at will
Literal = A value (10, 543, 4934030, 0x24, 'c', etc)

[Banfa]

Isn't that how most of the programming community operates nowadays? Build
on top of things you don't understand but just deliver. What a great scientific exercise.

Unfortunately you are correct, I am constantly surprised at how few C/C++ programmers know how a makefile works despite using them daily to build there projects.