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Swift - Repeat-While Loop



The Repeat-While Loop

The repeat-while loop is another version of while loop. It executes statements before checking the while conditions. Hence, it executes statements at least once and continues to repeat the loop until the while condition is false. It's functionality is same as do-while loop in C or C++.

Syntax

repeat {
  statements
} while (condition)

Flow Diagram:

Swift Repeat-While Loop

Example

In the example below, repeat loop is used to print numbers from 1 to 5.

var i = 1
repeat {
  print("i = \(i)")
  i = i + 1
} while(i < 6)

The output of the above code will be:

i = 1
i = 2
i = 3
i = 4
i = 5

Example:

Consider one more example, where the statements are executed once even if the while conditions are not fulfilled.

var i = 10
var sum = 0

repeat {
  sum = sum + i
} while(i < 6)
 
print(sum)

The output of the above code will be:

10

5