C-formatting in Swift

概述C-formatting in Swift is similar to that in C: create a String type variable or constant with a c-formatting string, and display the variable or constant using the print() function. let integerValue:

C-formatting in Swift is similar to that in C: create a String type variable or constant with a c-formatting string,and display the variable or constant using the print() function.

let integerValue: Int = 1let doubleValue: Double = 2.33let characterValue: Character = "c"let stringValue: String = "str"let boolValue: Bool = truelet characterValueStr = String(characterValue) // (1) Character -> Stringlet stringtoprint = String(format: "%d %.2f %@ %@",integerValue,doubleValue,characterValueStr,stringValue)print(stringtoprint)

result:

1 2.33 c str

Something to notice:
A Bool type value cannot be printed with "%b".

A Character type value cannot be printed with "%c". To print a Character type value,convert it into a String type value using the String() initializer,see (1) above.

A String type value can be printed with "%@",not "%s".

Actually we can use the string interpolation in Swift together with the c-formatting,which also enables us to display the Character and Bool type value easily.

let doubleValueStr = String(format: "%.2f",doubleValue)print("\(integerValue) \(doubleValueStr) \(characterValue) \(stringValue) \(boolValue)")

result:

1 2.33 c str true

references:
(1) Swift:字符串格式化
(2) Swift - 数字格式化转成字符串（保留两位小数）
(3) 输出格式化

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