case (C++)
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Category
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);
}
}