check positive number || upper case || check lower case

let inputValue = "A"

 

print("\u{30}") // result : 0

print("\u{39}") // result : 9

print("\u{41}") // result : A

print("\u{5a}") // result : Z

print("\u{61}") // result : a

print("\u{7a}") // result : z

 

// check positive number

if inputValue >= "\u{30}" && inputValue <= "\u{39}" {

    print("positive number")

} else {

    print("in not positive number")

}

 

// check upper case

if inputValue >= "\u{41}" && inputValue <= "\u{5a}" {

    print("upper case")

} else {

    print("is not upper case")

}

 

// check lower case

if inputValue >= "\u{61}" && inputValue <= "\u{7a}" {

    print("lower case")

} else {

    print("is not lower case")

}