A small command line calculator for macOS, using Calculate.framework

calculate.swift

import Foundation

let handle = dlopen("/System/Library/PrivateFrameworks/Calculate.framework/Calculate", RTLD_LAZY)
let CalculatePerformExpression = unsafeBitCast(dlsym(handle, "CalculatePerformExpression"), to:
	(@convention(c) (UnsafePointer<CChar>, Int, Int, UnsafePointer<CChar>) -> Bool).self)
let expression = Array(CommandLine.arguments.dropFirst()).joined(separator: " ")
let answer = Array<CChar>(repeating: 0, count: 100)
if CalculatePerformExpression(expression, 16, 1, answer) {
	print(String(cString: answer))
}