ios - Swift Closure why does calling function return error? -

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just learning closures , nesting functions. given nested function below:

func printerfunction() -> (int) -> () {     var runningtotal = 0     func printinteger(number: int) {         runningtotal += 10         println("the running total is: \(runningtotal)")     }     return printinteger }

why calling func have error, when assign func constant have no error? printandreturnintegerfunc(2) passing 2 int parameter have return value?

printerfunction(2) // error let printandreturnintegerfunc = printerfunction()  printandreturnintegerfunc(2) // no error. 2 going??

first of getting error here printerfunction(2) because printerfunction can not take argument , if want give argument can like:

func printerfunction(abc: int) -> (int) -> (){   }

and work fine:

printerfunction(2)

after giving reference of function variable this:

let printandreturnintegerfunc = printerfunction()

which means type of printandreturnintegerfunc this:

enter image description here

that means accept 1 int , return void work:

printandreturnintegerfunc(2)

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