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iOS Swift 2.0 Basics Swift Operators Working With Operators: Part 2

Posted by Yi Shao
Yi Shao
Courses Plus Student 305 Points

Wrong answer for task one?

For the first task it asks:"For this task to pass, we want both totalScore and initialScore to have the same value after the increment operation." But when I did "var initialScore = 8; let finalScore = initialScore++" it showed "wrong answer". And it showed "correct" when I change the code to "let finalScore = ++initialScore". As far as I know, the resultant value for the second code would be "initialScore = 8, finalScore = 9". Doesn't it contradict with the requirement of the task?

1 Answer

Anjali Pasupathy
Anjali Pasupathy
28,883 Points
Anjali Pasupathy
Anjali Pasupathy
28,883 Points

There is a subtle difference between "let finalScore = initialScore++" and "let finalScore = ++initialScore".

"let finalScore = initialScore++" is equivalent to the following code:

let finalScore = initialScore // finalScore has been set to 8
initialScore += 1 // initialScore is now 9

"let finalScore = ++initialScore" is equivalent to the following code:

initialScore += 1 // initialScore is now 9
let finalScore = initialScore // finalScore has been set to 9

I hope this helps!