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Switch statement with char*?

ChaosPhoenix · 2002-09-03T19:56:32

Im trying to use a switch statement to determ what action the user wants by commands, however, The user text commands are stored as char* and I apparently can''t use that in a Switch statement. Any suggestions to allow me to use my char* in a switch statement or somehow convert it to just char?

General and Gameplay Programming Programming

Started by ChaosPhoenix September 03, 2002 03:53 AM

16 comments, last by ChaosPhoenix 21 years, 7 months ago

Beer Hunter

712

September 03, 2002 05:37 AM

quote:Original post by biovenger
return (strcmp(c1, c2) < 0)

In addition to SabreMan''s comment, I''d like to point out that strcmp returs zero if its paremeters are equal.

siaspete

208

September 03, 2002 05:59 AM

Just to try and clarify what people have said so far, when comparing c-style strings with == or switch an important thing to realise is that you''re not comparing the contents of the strings, just the addresses of their first character.

This is almost certainly not what you want.

Helpful links:
How To Ask Questions The Smart Way | Google can help with your question | Search MSDN for help with standard C or Windows functions

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jkeppens

122

September 03, 2002 06:12 AM

You could use enums... these can be used with a switch statement

switch(computer) {case COMPUTER_1:   ...   break;case COMPUTER_2:   ...   break;}

Paradigm Shifter

5,832

September 03, 2002 07:22 AM

I''d suggest having a look at the std::map class, you can map a unique string onto a function or map it to an enum value.

"Most people think, great God will come from the sky, take away everything, and make everybody feel high" - Bob Marley

Anonymous

September 03, 2002 10:04 AM

there is a code solution to this problem over on www.codeguru.com

Anonymous

September 03, 2002 10:26 AM

if(strcmp){}
else if(strcmp){}
else if(strcmp){}
else {}

Beer Hunter

712

September 03, 2002 06:06 PM

quote:Original post by Paradigm Shifter
I'd suggest having a look at the std::map class, you can map a unique string onto a function or map it to an enum value.

Hmmm...

  void addToComputer1(int time) { computer1.time += time; }void addToComputer2(int time) { computer2.time += time; }...map<string, void(*)(int)> dispatcher;dispatcher["Computer1"] = addToComputer1;dispatcher["Computer2"] = addToComputer2;...map<string, void(*)(int)>::const_iterator i = dispatcher.find(tempString);if (i == dispatcher.end()) throw logic_error("blah");(*i).second(time);

...that might be a bit confusing to some people

[edited by - Beer Hunter on September 3, 2002 7:09:18 PM]

CWizard

127

September 03, 2002 07:55 PM

Probably not useful for you, but if you have single-char commands, you can do this:

    switch((int)(char)*szCommand) {    case 0x41: // A (can one use case "A": here?)    case 0x47: // G    }

You can make this more complicated if you allow 4 chars, or if only the first 4 count:

    switch(*(int *)Command) {    case 0x41424344: // ABCD    case 0x47414D45: // GAME    }

That would require that all commands are at least 4 chars, or that the following data always are the same/cleard.

EDIT: Making the int usigned would probably be a good idea

[edited by - CWizard on September 3, 2002 8:56:32 PM]

Switch statement with char*?

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