define a function that uses pointers in swift

In Swift, you can use pointers to refer to memory addresses and manipulate the data stored in those addresses. To define a function that uses pointers, you can use the "inout" keyword before the parameter name to indicate that the parameter is an "in-out" parameter, which means that it can be modified by the function and those modifications are reflected back to the caller after the function completes.

Here is an example function that uses pointers in Swift:

main.swift
func swapValues(_ a: inout Int, _ b: inout Int) {
    let tmp = a
    a = b
    b = tmp
}

var x = 10
var y = 20

// Pass pointers to the variables to the function
swapValues(&x, &y)

print(x) // Output: 20
print(y) // Output: 10
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In this example, the "swapValues" function takes two "in-out" parameters, "a" and "b", which are pointers to Int variables. The function swaps the values of "a" and "b" by using a temporary variable "tmp". To call the function, you pass the pointers to the variables using the "&" operator. After the function completes, the variables "x" and "y" have been swapped due to the modifications made by the function using pointers.