Swift conditional statement
Conditional statements through one or more set conditions to execute the program, execute the statement specified condition is true, execute additional statement specified condition is false.
The following figure can be a simple understanding of the execution of the conditional statement:
Swift provides the following types of conditional statements:
| Statements | description |
|---|---|
| if statement consists ofa Boolean expression and one or more execution statements. | |
| You can have an optionalelse statement if statement,elsestatementexecutes the Boolean expression is false. | |
| You can have an optionalelse if after if... elsestatement,else if ... else statement is often used to determine a number of conditions. | |
| You can be embeddedif the ifstatement orelse iforelse ifthe. | |
| switch statement allows a variable equal to a plurality of test value. |
?: Operator
We have already explained in previous chapters of theconditional operator:?, Can be used instead if ... elsestatement. Its general form is as follows:
Exp1 ? Exp2 : Exp3;
Wherein, Exp1, Exp2 and Exp3 expression. Please note that the use of the colon and location.
? Exp1 value of the expression is determined. If Exp1 is true, then the calculated value Exp2, the result is the entire? Expression. If Exp1 is false, then the calculated value Exp3, the result is the entire? Expression.