Swift Swift Notice that the conditional expression appears at the end of the loop, so the If the condition is The number 0, the strings’0’ and’’, empty Flow chart: The output of the above program execution is as follows: repeat...while the cycle is not like for and while the loop judges the conditional statement before the loop body starts execution,but determines whether the condition is met at the end of the loop execution. 9.20.1. Grammar #
repeat...while the syntax format of the loop is as follows:repeat { statement(s); }while( condition );
statement(s) will be executed at least once before the conditionis tested. true the control flow will jump back to the above repeat and then re-execute the statement(s) . This process is repeated over and over again until a given condition becomes false so far. list() and undefined variables are false and the rest are true . true use it backwards! Number or not , take the reverse and return false .
9.20.2. Example #
import Cocoa var index = 15 repeat{ print( "The value of index is \(index)") index = index + 1 }while index < 20
The value of index is 15 The value of index is 16 The value of index is 17 The value of index is 18 The value of index is 19