Hi folks,
I am trying to create a C++ program that will operate a switch statement. I have since found out that I cannot switch with strings as i need to. Each case in the switch will be designed to set a string variable.
Is there any way to achieve what I am suggesting. I have heard about maps, but i think that they are too complex for the simple task that i am trying to program.
Regards and thanks in advance,
mintsmike
Maybe try doing string comparisons, like...
Just a quick example of what I'm thinking, I typed it up in the reply window so its obviously not perfect.Code:string stuff1 = "meh"; int sw_case = 0; if(stuff1 == "meh") sw_case = 0; else if(stuff1 == "blah") sw_case = 1; switch(sw_case){ case 0: break; case 1: break; }
A map could be more appropriate and not too complicated.
A major difference is that unlike a switch or an if chain, the map's data won't need to be hard-coded.
I might be wrong.
Quoted more than 1000 times (I hope).Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
In the old days I've used something like this:
This assumes that codestring is a series of 5 character or less codes, like:Code:p = codestring.find( entry ) / 5; switch( p ) { ... }
Obviously this pseudo code doesn't account for a non-match. For short lists (say 20 or less) it's not much slower than a map.Code:codestring = "one two three four";
It is a naive approach. There is the potential for an odd match. If a key happens to be a subword of another key, for example, it can fail without additional effort.
Last edited by JVene; 05-02-2009 at 08:17 AM.
Can you direct me to some resource that teaches how to use maps in this way.
Regards
I don't see why you'd want to do it... It doesn't really make sense to me. Are you just trying to see if the guy enters something? Either way, this might work.Code:#include <iostream> #include <string> #include <vector> int main( void ) { std::string searchStr; std::vector<std::string> inputOptions; std::vector<std::string>::iterator::difference_type pos; inputOptions.push_back( "one" ); inputOptions.push_back( "two" ); // etc std::cout<< "What do you want to switch: "; std::cin >> searchStr; pos = std::find(inputOptions.begin(),inputOptions.end(),searchStr) - inputOptions.begin(); switch ( pos ) { case 0: std::cout<< "First position\n"; break; case 1: std::cout<< "Second position\n"; break; default: std::cout<< "Not found\n"; break; } return 0; }
