IT. Expert System.

C++

switch


A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each case.

Syntax:
switch(expression){
    case constant-expression  :
       statement(s);
       break; //optional
    case constant-expression  :
       statement(s);
       break; //optional
  
    // you can have any number of case statements.
    default : //Optional
       statement(s);
}


Example:

#include 
using namespace std;
 
int main ()
{
   // local variable declaration:
   char grade = 'D';

   switch(grade)
   {
   case 'A' :
      cout << "excellent!" << endl; 
      break;
   case 'b' :
   case 'c' :
      cout << "well done" << endl;
      break;
   case 'd' :
      cout << "you passed" << endl;
      break;
   case 'f' :
      cout << "better try again" << endl;
      break;
   default :
      cout << "invalid grade" << endl;
   }
   cout << "your grade is " << grade << endl;
 
   return 0;
}


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