- Selection methods –
- If/else/else –if
- Switch
- A switch statement allows a variable to be compared against a list of values for equality. Each value is referred to as a case, and each switch case is compared to the variable that is being true.
switch(expression) {
case 01:
// code
block
break;
case 02:
// code block
break;
default:
// code block
}
Rules for use Switch Case
- Switch expression is integer or
character (byte, short, int, char……. etc.)
- Use any number of case statements
within a switch.
- Data type must match between switch
and cases.
- When the variable matches,
expressions are executed until a “break” is meet. (explain by follow test code.)
- A switch statement can have an
optional default case, which must appear at the end of the switch.
Flow Diagram
 |
| Flow chart of Switch case of c++ |
Code 01:
#include
<iostream>
using
namespace std;
int
main () {
char department;
cin >> department;
switch(department) {
case 'A' :
cout << "department A"
<< endl;
break;
case 'B' :
cout << "department B"
<< endl;
break;
case 'C' :
cout << "department C"
<< endl;
break;
case 'D' :
cout << "department D"
<< endl;
break;
default :
cout << "Sorry...you
entered Invalid department" << endl;
}
cout << "Your department: " << department << endl;
return 0;
}
Code 02: Study output results without break.
Note :
Use toupper(_) to convert lowercase to uppercase.
#include <iostream>
using namespace std;
int main () {
// local variable
declaration
char department1;
cin >> department1;
// Use toupper
char department =
toupper(department1);
switch(department) {
case 'A' :
cout <<
"department A" << endl;
case 'B' :
cout <<
"department B" << endl;
case 'C' :
cout <<
"department C" << endl;
case 'D' :
cout <<
"department D" << endl;
default :
cout <<
"Sorry...you entered Invalid department" << endl;
}
cout << "Your department: " << department << endl;
return 0;
}
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