[C++] Switch con operatori condizionali

[kirakira93]

Ciao ragazzi!

int numero;

switch (numero)
{
case (numero<100) :/*bla bla bla*/;break;
case (numero>=100&&numero<200):/*bla bla bla*/;break;
case (numero>=200&&numero<300):/*bla bla bla*/;break;
default: MessageBox(NULL,"The number is bigger than consented input","",0);break;

}


HELP PLEASE!!!

[MItaly]

Non si può fare con uno switch, devi ricorrere ad una serie di if ... else if.

[kirakira93]

Grazie

[MItaly]

[MacApp]

Puoi anche fare a meno degli "if":

/*

Isidoro Ghezzi, 2 feb 2010

$ g++ --version; g++ -ansi -pedantic -Wextra -Wconversion main.cpp; ./a.out 
i686-apple-darwin8-g++-4.0.1 (GCC) 4.0.1 (Apple Computer, Inc. build 5367)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The number -5 is less than 1;
The number 0 is less than 1;
The number 1 is between 1 and 10;
The number 2 is between 1 and 10;
The number 10 is between 1 and 10;
The number 2010 is greater than 10;

*/

#include <iostream>
#include <algorithm>

namespace ig{
	void TestNoSwitchAndIf (const int theSelector){
		const char * kCStringContainer []={
			"less than 1",
			"between 1 and 10",
			"greater than 10"
		};
		
		const unsigned short aIndex = (theSelector >= 1) + (theSelector > 10);
		std::cout << "The number " << theSelector <<
		" is " << kCStringContainer [aIndex] << ";" << std::endl;
	}
}

int main (void){
	const int kTestContainer []={
		-5, 0, 1, 2, 10, 2010
	};
	
	std::for_each (kTestContainer,
		kTestContainer + sizeof (kTestContainer)/sizeof (kTestContainer [0]),
		ig::TestNoSwitchAndIf
	);
	return 0;
}

;-)

[MItaly]

"Overkill" mi pare la parola più adatta.