Concatenate Int like String in Swift?

Question

I need Something like

var a = 1
var b = 2
var c = a + b should be 12 (Int) instead of 3.

var a = 12
var b = 34
var c = a + b should be 1234 (Int) instead of 46.

I am not figuring out how can we do this for any number?

One way is to convert two both Int to String, concatenate and covert it again that String to Int, but I don't think it's efficient.

Thank you in advance if you have a solution.

Answer 1

12+34 = 12*10^2 + 34 = 1200+34 = 1234

func logC(val: Double, forBase base: Double) -> Double {
    return log(val)/log(base)
}

var a = 10
var b = 0
let x = b == 10 ? 2 : b == 0 ? 1 : ceil(logC(val: Double(b), forBase: 10))
var c = Int(Double(a) * pow(10, x) + Double(b))
print(c)

Answer 2

You can do it with simple conversion like below:

var a = 1
var b = 2
var c = Int("\(a)\(b)") // Result 12

var a1 = 12
var b1 = 34
var c1 = Int("\(a1)\(b1)")  // Result 1234


var a2 = 122344
var b2 = 9022
var c2 = Int("\(a2)\(b2)") // Result 1223449022