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case (C++)

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Category

Statements

Syntax

switch(switch_variable) {casebreakdefault
  case constant_expression: statement; // [break;]
  // …
  default: statement;
}

Description

Use the case statement in conjunction with switches to determine which statements evaluate.

The list of possible branch points within <statement> is determined by preceding substatements with

case constant_expression: statement;

where <constant expression> must be an int and must be unique.

The <constant expression> values are searched for a match for the <switch variable>.

If a match is found, execution continues after the matching case statement until a break statement is encountered or the end of the switch statement is reached.

If no match is found, control is passed to the default case.

Note: It is illegal to have duplicate case constants in the same switch statement.

Example

This example illustrates the use of keywords break, case, default, return, and switch.

 
 #include <iostream>
 
 using namespace std;
 
 int main(int argc, char* argv[])
 {
   char ch;
 
   cout << "PRESS a, b, OR c. ANY OTHER CHOICE WILL TERMINATE THIS PROGRAM." << endl;
   for ( /* FOREVER */; cin >> ch; )
     switch (ch)
     {
       case 'a' :    /* THE CHOICE OF a HAS ITS OWN ACTION. */
         cout << endl << "Option a was selected." << endl;
         break;
       case 'b' :    /* BOTH b AND c GET THE SAME RESULTS. */
       case 'c' :
         cout << endl << "Option b or c was selected." << endl;
         break;
       default :
         cout << endl << "NOT A VALID CHOICE!  Bye ..." << endl;
         return(-1);
     }
 }

See Also

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