Can somebody explain why it doesn't output the value of C?
[code]1: #include <iostream.h>
2: int main()
3: {
4: int a = 1, b = 1, c;
5: if (c = (a-b))
6: cout << "The value of c is: " << c;
7: return 0;
8: }
[/code]

Also, what is the difference between "\n" and endl?

[quote author=j0k3r link=board=30;threadid=5898;start=0#msg50704 date=1079903491]
Can somebody explain why it doesn't output the value of C?
[code]1: #include <iostream.h>
2: int main()
3: {
4: int a = 1, b = 1, c;
5: if (c = (a-b))
6: cout << "The value of c is: " << c;
7: return 0;
8: }
[/code]

Also, what is the difference between "\n" and endl?
[/quote]

1. Because c, and the expression inside the if statement as a whole, is false

2. "\n" is a string while endl is an iostream manipulator, but they have the same effect

[quote]
5: if (c = (a-b))
[/quote]

shouldn't that be

[code]
if (c == (a - b))
[/code]

[quote author=Eli_1 link=board=30;threadid=5898;start=0#msg50711 date=1079905552]
[quote]
5: if (c = (a-b))
[/quote]

shouldn't that be

[code]
if (c == (a - b))
[/code]
[/quote]

No, that was his entire question: assignment in If statement


#2 - Although Adron's basically correct, endl has some weird property involving Flushing the Stream. Eibro explained it to me once but I don't remember.

Ah.

http://www.cplusplus.com/ref/iostream/ostream/_endl.html

But then, if he didn't want a guess, he would've probably googled 5 seconds himself instead of asking?

It's *hard* to find websites which compare "\n" to endl, or comarisons for specific things in general (even google).

But why is the expression incorrect? I thought assignment expressions always turned out true.

No, assignment expressions return the new value of the variable.

printf("%d\n", a=4);

Will display "4".

[quote author=j0k3r link=board=30;threadid=5898;start=0#msg50734 date=1079911821]
It's *hard* to find websites which compare "\n" to endl, or comarisons for specific things in general (even google).
[/quote]

Well, look up one thing at a time and see what it does, then compare them yourself.... I searched for "endl iostream" on google and picked the last hit of the first page.

I blame my schoolboard for teaching us a bad programming language. Thanks for help.

Yes, std::endl prints a newline then calls std::ostream::flush(), which in turn calls std::streambuf::sync().

[quote author=Eibro link=board=30;threadid=5898;start=0#msg50748 date=1079914791]
Yes, std::endl prints a newline then calls std::ostream::flush(), which in turn calls std::streambuf::sync().
[/quote]

So, the conclusion is that for text files you should use "\n", and not endl.

[quote author=Adron link=board=30;threadid=5898;start=0#msg50750 date=1079915252]
[quote author=Eibro link=board=30;threadid=5898;start=0#msg50748 date=1079914791]
Yes, std::endl prints a newline then calls std::ostream::flush(), which in turn calls std::streambuf::sync().
[/quote]

So, the conclusion is that for text files you should use "\n", and not endl.
[/quote]
Are you talking about writing to text files? Which would be best to use in a game?

[quote author=j0k3r link=board=30;threadid=5898;start=0#msg50781 date=1079924903]
[quote author=Adron link=board=30;threadid=5898;start=0#msg50750 date=1079915252]
So, the conclusion is that for text files you should use "\n", and not endl.
[/quote]
Are you talking about writing to text files? Which would be best to use in a game?
[/quote]

Yes, for writing to text files. I'm not sure where you'd use endl or \n in a game?

Chat? Text for something (in a campaign for example).

[quote author=j0k3r link=board=30;threadid=5898;start=0#msg50834 date=1079958163]
Chat? Text for something (in a campaign for example).
[/quote]

I suppose that depends on how you're coding it.... You're not likely to write to a standard output or file stream anyway for chat or text output, more likely to use some kind of gui control.