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For Beginners

Started by brian_m99uk March 02, 2008 12:48 PM

14 comments, last by superpig 16 years, 1 month ago

3,219

March 03, 2008 07:39 AM

Quote:Original post by Darragh
Quote:Original post by shadowisadog
C++ is a LOT harder of a language than Python. If you got confused with Python than what makes you think that C++ is a better choice? O_o.

I can see where he's coming from actually. I've been programming in C/C++ for about 4 years now and recently I started learning Ruby, which in many ways is quite similar to Python or Perl. One of the main difficulites I found during my time working with Ruby was that sometimes I could write a statement and not know exactly what it was doing; the language is so high level that it's sometimes difficult to determine exactly what the effect of each statement is. It's always a decidedly dodgy business when you start writing code and you're not even sure what it is doing IMHO!

Very true. I have programmed in C++ for over six years but I have recently started to move to higher level languages because work demanded it. My main point is that C++ is a much more confusing language for a novice to start with. When I started programming I actually used QBasic and some other now extinct languages to learn the basics and only later did I decide to make the leap to C++. C++ has a lot of undefined behaviors and if you don't know how to work with pointers you can cause a lot of memory leaks and crashes very quickly.

[Edited by - shadowisadog on March 3, 2008 12:39:45 PM]

Darragh

308

March 03, 2008 08:20 AM

Quote:Original post by shadowisadog
C++ has a lot of undefined behaviors and if you don't know how to work with pointers you can cause a lot of memory leaks and crashes very quickly.

Indeed. Like I'm sure there are lot's of people out there with a good working knowledge of the language who might even be confused by statements such as these:

// ? void _cdecl blah();void _stdcall blah2();// ? :)void blah2( void * p ){   ((void(*)())(p))();}

Things like that you just don't see the books on C++ and it's rife in some of the code you will come across on the net.

www.darraghcoy.com - projects

TheUnbeliever

963

March 03, 2008 11:47 AM

Quote:Original post by superpig
Quote:Original post by TheUnbeliever
A dictionary provides a 1:1 mapping (a bijection) from a set of keys to a set of values (in much the same way as its real-world namesake does – the word in a real-world dictionary is the key, and the definition the value).

Er, really? Every key maps to a unique value, and it's therefore possible to get from the value back to the key?

Oops. No. It'd be a surjection, not a bijection (right?).

My apologies.

[TheUnbeliever]

Zahlman

1,682

March 03, 2008 11:52 AM

Quote:Original post by superpig
Quote:Original post by TheUnbeliever
A dictionary provides a 1:1 mapping (a bijection) from a set of keys to a set of values (in much the same way as its real-world namesake does – the word in a real-world dictionary is the key, and the definition the value).

Er, really? Every key maps to a unique value, and it's therefore possible to get from the value back to the key?

For reference. The mapping is a surjection: you can repeat values, and the mapping is therefore not reversible (unless you avoid repeating values manually, and reverse the mapping yourself).

brian_m99uk

122

Author

March 03, 2008 02:19 PM

Woo,

Well im getting into this python thing ive done hello worlds, and getting me to input my name. It was deffinatly the book i was looking at.

Well now ill not be revisiting this thread as it seems to have spiraled out into things i dont know about.

Well here i go into the breach.

o/

Brian.

superpig

1,826

March 03, 2008 02:42 PM

Quote:Original post by Zahlman
Quote:Original post by superpig
Quote:Original post by TheUnbeliever
A dictionary provides a 1:1 mapping (a bijection) from a set of keys to a set of values (in much the same way as its real-world namesake does – the word in a real-world dictionary is the key, and the definition the value).

Er, really? Every key maps to a unique value, and it's therefore possible to get from the value back to the key?

For reference. The mapping is a surjection: you can repeat values, and the mapping is therefore not reversible (unless you avoid repeating values manually, and reverse the mapping yourself).

Well, no; it's neither injective (one-to-one) nor surjective (covering every possible target value). It's just a mapping.

Richard "Superpig" Fine - saving pigs from untimely fates - Microsoft DirectX MVP 2006/2007/2008/2009
"Shaders are not meant to do everything. Of course you can try to use it for everything, but it's like playing football using cabbage." - MickeyMouse

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