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Functions

Swift

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// function to add two numbers
func addTwoNumbers(number1: Int?, number2: Int?) -> Int? {
    if let n1 = number1, let n2 = number2 {
        return n1 + n2
    }
    return nil
}

// function to subtract two numbers
func subtractTwoNumbers(number1: Int?, number2: Int?) -> Int? {
    if let n1 = number1, let n2 = number2 {
        return n1 - n2