Swift if…else statement
One if statement can be followed by an optional else statement else statement in a Boolean expression false when it is executed.
Grammar
In Swift language if...else syntax of the statement:
if boolean_expression {
/* The statement to be executed if the Boolean expression is true */
} else {
/* The statement to be executed if the Boolean expression is false */
}
If the Boolean expression is true , then execute if the code within the block. If the Boolean expression is false , then execute else the code within the block.
Flow chart
Example
import Cocoa
var varA:Int = 100;
/* Detect Boolean conditions */
if varA < 20 {
/* If the condition is true, execute the following statement */
print("varA ＜ 20");
} else {
/* If the condition is false, execute the following statement*/
print("varA ＞ 20");
}
print("The value of the varA variable is \(varA)");
When the above code is compiled and executed, it produces the following results:
varA ＞ 20
The value of the varA variable is 100