For getting specific bit of an integer in Swift, we could do it by using bit shifting operator:
// ex: UInt8 integer 11001
let num = UInt8(25)
for i in stride(from: 7, through: 0, by: -1) {
let curBit = (num >> i) & 1
print(curBit)
}
/* Output:
0
0
0
1
1
0
0
1
which is 00011001
*/
Swift also provide a String init(_:radix:uppercase:) function for directly transfer Int to given base String format:
let v = 999_999
print(String(v, radix: 2))
// Prints "11110100001000111111"
print(String(v, radix: 16))
// Prints "f423f"
print(String(v, radix: 16, uppercase: true))
// Prints "F423F"
which could be convert to Int by Int init(_:radix:):
let x = Int("123")
// x == 123
let y = Int("-123", radix: 8)
// y == -83
let y = Int("+123", radix: 8)
// y == +83
let z = Int("07b", radix: 16)
// z == 123
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