a = b; Help?

Ok im a bit stuck with Operators. I have this code, but dont know what some parts mean.

Code:

---

#include <iostream>
using namespace std;

int main ()
{
    int a, b=3, c=1, d=5;
 
    a = b;                    << What do these parts mean?
    c = d;                      << ???
 
    c+=1;
    d+=2;           
    cout << d;
 
    cin.get();
 
    return 0;
}

---

Thank you!

Take your best guess. You'll probably be right.

I think (but I'm not sure) that it means that a equals b... but I could be wrong.

Quote:

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Originally Posted by skizmo

i think (but i'm not sure) that it means that a equals b... But i could be wrong.

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:d:d:d

Quote:

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Originally Posted by iPirate

Ok im a bit stuck with Operators. I have this code, but dont know what some parts mean.

a = b; << What do these parts mean?
c = d; << ???

---

Really? From that entire program THESE two lines are most confusing???

Oh, i see.
Sorry i understand now.

The noob i am.

[ Moved thread ]

This is so incredibly basic that I had trouble finding a page on it that wasn't going to confuse you further by referring to class operator overloading and the like, but this one comes pretty close:
http://en.wikipedia.org/wiki/Assignm...in_C&#37;2B%2B

Quote:

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Originally Posted by iPirate

Yes, I dont understand what they do.

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Add some cout statements before and after those two lines of code such as:

std::cout << "a = " << a << std::endl;
std::cout << "b = " << b << std::endl; // and so forth

This will tell you the before and after values for each variable. Also, you could compile and run the program. Step into the program with the debugger and analyze the values before and after the statements.

I recommend you pick up a really, really basic (for super beginners) book on C/C++.

Anyways.

Think of a, b, and c as memory locations because in C/C++ that's what they are.
e.g.
Whenever you:

int a;

You're allocating a space in memory with label "a" and type int (integer).

When you see the expression:

a = b;

The "=" doesn't mean "equals" but it rather means "is assigned" so if we translate it would read:

"a is assigned b"

If you still don't understand, what that statement does is that it takes anything that is currently allocated in the left side of the operator (=) and assigns it whatever is located on the right side.

I hope this helps.

Quote:

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Originally Posted by kempofighter

Add some cout statements before and after those two lines of code such as:

std::cout << "a = " << a << std::endl;
std::cout << "b = " << b << std::endl; // and so forth

This will tell you the before and after values for each variable. Also, you could compile and run the program. Step into the program with the debugger and analyze the values before and after the statements.

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Ah thanks

Also i know how Variables work etc.
Just i didnt know what a = b meant, until now of course.

yo,

if you ever get stuck on anything, feel free to send me a pm, etc.

Quote:

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Originally Posted by EsX_Raptor

yo,

if you ever get stuck on anything, feel free to send me a pm, etc.

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That kind of defeats the point of the forum. The advantage to keeping it public is we can monitor and correct each other when necessary, and provide potentially better solutions. Even those of us with thousands of posts make mistakes, and it's good to have other people there to catch them.

Quote:

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Originally Posted by EsX_Raptor

yo,

if you ever get stuck on anything, feel free to send me a pm, etc.

---

Yo, I wold like to ask it in the forum... ;)

lol this sites got the pms blocked

btw GCDEF you ever heard of a term called "friendship?"

wait lemme google it

Of course not. We're computer nerds. None of us actually has any friends, just public interfaces.

Quote:

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Originally Posted by Lindley

Of course not. We're computer nerds. None of us actually has any friends, just public interfaces.

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Besides, friends violate encapsulation. :rolleyes:

Quote:

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Originally Posted by EsX_Raptor

btw GCDEF you ever heard of a term called "friendship?"

wait lemme google it

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This is a public programming forum. If you're just looking for a friend, perhaps Craigslist or match.com could hook you up.

sorry, but i'm not "just looking for a friend."

i just saw the guy is pretty new to C++ and wanted to be his friend because i like helping others.

if i was "just looking for a friend" I'd be hanging out with my peeps at this time.

Quote:

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Originally Posted by Speedo

Besides, friends violate encapsulation. :rolleyes:

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Not according to Bjarne. ;)
http://www.research.att.com/~bs/bs_faq2.html#friend

Surely just because it's explicit it doesn't mean that it doesn't violate it?

Quote:

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Originally Posted by kempofighter

Not according to Bjarne. ;)
http://www.research.att.com/~bs/bs_faq2.html#friend

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It was a bad joke based on a somewhat popular opinion. Hence the rolleyes smilie.

Quote:

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Originally Posted by Mybowlcut

Surely just because it's explicit it doesn't mean that it doesn't violate it?

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I'd like to see it that friend is there so you can "violate it" without "breaking it".

Quote:

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Originally Posted by Lindley

None of us actually has any friends, just public interfaces.

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I have some protected interfaces reserved for future children.

Quote:

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Originally Posted by Mybowlcut

Surely just because it's explicit it doesn't mean that it doesn't violate it?

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It depends. If you believe that member functions violate encapsulation, then it is reasonable for you to believe that friends violate encapsulation. Otherwise, it is a matter of degree: friends reduce encapsulation.

My recommended online reading list related to this topic:
How Non-Member Functions Improve Encapsulation - Meyers
Designing Simple Interfaces - Stroustrup
Monoliths "Unstrung" - Sutter

Quote:

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Originally Posted by Mybowlcut

Surely just because it's explicit it doesn't mean that it doesn't violate it?

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Huh?

iPirate:

The most fun part of learning to program is figuring stuff out yourself. Try changing things in the program and see how it affects your results. Like try changing the numbers, changing cout << d to cout << a etc. See what happens, and you can probably figure that stuff out yourself.