Literal aggregation

 1.  Boolean 
    let bool =true // Reverse is false
 2.  character string 
    let string =@" Who am I "
 3.  character 
    // character ( Storable ASCII character ,Unicode character ) 
    let character: Character =" puppy "
 4.  Integers 
    let intDecimal = 17 // Decimal system 
    let intBinary = 0b1001 // Binary system 
    let intOctal = o021 // octal 
    let intHexadecimal = 0x11 //  Hexadecimal 
 5.  Floating point numbers 
    let doubleDecimal = 125.0 // Decimal system , Equivalent to 1.25e2
    let doubleHexadecimal1 = 0xFp2 // Hexadecimal , signify 15x2^2, The decimal equivalent of 60.0
    let doubleHexadecimal2 = 0xFp-2 // Hexadecimal , signify 15x2^-2, The decimal equivalent of 3.75
   
   /*  Integers and floating-point numbers can add extra zeros or underscores to enhance readability   for example :100_000, 1_000_000.000_000_1 */
 6. Array 
    let array=[1,3,4,5,7,8];
 7. Dictionaries 
    let dic = ["age":18,"height":20];
 8. Tuples 
    let http404Error = (404,"Not Found")
    // http404Error.0  Represents the first value taken out 
 
    let (ststusCode,statusMessage) = http404Error
    // The representatives will http404Error The two values inside are assigned to the left .

    let (jusTheCode,_) = http404Error
    //_ Indicates that the parameter is not accepted , It only needs http404Error The first value in 404

    let http200Status = (ststusCode:200,des:"OK")
    // Carry identifier , When taking value, you can directly point and call  http200Status.des