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iOS Swift Basics (retired) Control Flow While and Do-While Loop

Why must println and index++ be on new lines for the code to work?

I'm total new to programming. I did this task in Xcode and no result appeared in the assist. editor until I pressed enter and moved the index++down to a new line in Xcode. The video left out the fact that if I want to write this code in one single line I must separate the index++ with " ; "or i have to write index++ on a different line. Xcode states "Consecutive statements on a line must be separated by ; " or written on a different line. Can you explain why? Code example: Doesn't work: var index = 0 while index <numbers.count{println(numbers[index])index++} Does: var index = 0 1.while index < numbers.count{println(numbers[index]);index++} 2.var index = 0 while index < numbers.count {println(numbers[index]) index++} (Index is one line down)