Swift Addition: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (Code=EXC_l386_INVOP, subcode=0x0)
<p>I'm trying to add two numbers in Swift and print its sum </p>

<pre><code>import Foundation

func solveMefirst(firstNo: Int , secondNo: Int) -&gt; Int {
    return firstNo + secondNo
}

let num1 = readLine()
let num2 = readLine()

var IntNum1 = Int(num1!) ** Execution was interrupted, reason: EXC_BAD_INSTRUCTION (Code=EXC_l386_INVOP, subcode=0x0). **
var IntNum2 = Int(num2!)

let sum = solveMefirst(IntNum1!, secondNo: IntNum2!)
print(sum)
</code></pre>

<p>But unfortunately this error comes out and stops the execution in playground.</p>

<pre><code>Execution was interrupted, reason: EXC_BAD_INSTRUCTION (Code=EXC_l386_INVOP, subcode=0x0).
</code></pre>

<p><a href="https://i.stack.imgur.com/S8o2A.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/S8o2A.png" alt="enter image description here"></a></p>

<p>Could not understand, what is wrong in this?</p>

<p><strong>UPDATE</strong></p>

<p>Also please explain how to run this command line program in playground?</p>

<p>How can I take input from playground??.</p>