On the basis of the Condition value, this statement decides whether the Statement should be executed. If the Condition is true, the Statement is executed. If it is false, the Statement is ignored and the process continues next after the if statement. The Statement is either a simple statement or a block of statements

Unlike the previous version of the if statement (in which the Statementis executed only if the Condition is true), other Statements that should be executed even if the Condition value is false can be added to the if statement. Thus, if the Condition is true, the Statement1 is executed, if it is false, the Statement2 is executed. See below:

The Statement2 can even be another if statement and also with else branch:

integer a = 123;
if ( a < 0 ) {
    a = -a;
    }

Sometimes you would have very complicated statement, if you created the statement of more branched out if statement. In this case, it is much more convenient to use the switch statement.

Now, instead of the Condition as in the if statement with only two values (true or false), an Expression is evaluated and its value is compared with the Constants specified in the switch statement.

Only the Constant that equals to the value of the Expression decides which of the Statements is executed.

If the Expression value is Constant1, the Statement1 will be executed, etc.

	Important
	Remember that literals must be unique in the Switch statement.

The optional break; statements ensure that only the statements corresponding to a constant will be executed. Otherwise, all below them would be executed as well.

In the following case, even if the value of the Expression does not equal the values of the Constant1,...,ConstantN, the default statement (StatementN+1) is executed.

integer ok = 0;
switch ( response ) {
    case "yes":
    case "ok":
        a = 1;
        break;
    case "no":
        a = 0;
        break;
    default:
        a = -1;
}