簡易運算子

標籤

• 算數運算子
• 指定運算子
• 關係運算子
• 邏輯運算子
• 運算子優先順序

算術運算子

let x = 50, y = 20
print("\(x) + \(y) = \(x + y)")
print("\(x) - \(y) = \(x - y)")
print("\(x) * \(y) = \(x * y)")
print("\(x) / \(y) = \(x / y)")
print("\(x) % \(y) = \(x % y)")
let x = Float(50), y = Float(20)
print("\(x) / \(y) = \(x / y)")
let x = Double(50), y = Double(20)
print("\(x) / \(y) = \(x / y)")

• 輸出結果

  50 + 20 = 70
  50 - 20 = 30
  50 * 20 = 1000
  50 / 20 = 2
  50 % 20 = 10
  50.0 / 20.0 = 2.5
  50.0 / 20.0 = 2.5
  

  • 附註：兩數相除需資料型態相同

指定運算子

var number = 50
    number += 50
    print("\(number) += 50 = \(number)")
    number -= 50
    print("\(number) -= 50 = \(number)")
    number *= 2
    print("\(number) *= 2 = \(number)")
    number /= 2
    print("\(number) /= 2 = \(number)")
    number %= 40
    print("\(number) %= 40 = \(number)")

• 輸出結果

  50 += 50 = 100
  50 -= 50 = 0
  50 *= 2 = 100
  50 /= 2 = 25
  50 % 40 = 10
  

關系運算子

let x = 50, y = 20
print("\(x) > \(y) = \(x > y)")
print("\(x) >= \(y) = \(x >= y)")
print("\(x) < \(y) = \(x < y)")
print("\(x) <= \(y) = \(x <= y)")
print("\(x) == \(y) = \(x == y)")
print("\(x) != \(y) = \(x != y)")

• 輸出結果

  50 > 20 = true
  50 >= 20 = true
  50 < 20 = false
  50 <= 20 = false
  50 == 20 = false
  50 != 20 = false
  

邏輯運算子

let x = 50, y = 20
let andValue: Bool = x == 50 && y != 20
print("\(x) == 50 && \(y) != 20 = \(andValue)")
let orValue: Bool = x == 50 || y != 20
print("\(x) == 50 || \(y) != 20 = \(orValue)")
let notValue: Bool = !(x == 50)
print("!(\(x) == 50) = \(notValue)")

• 輸出結果

  50 == 50 && 20 != 20 = false
  50 == 50 || 20 != 20 = true
  !(50 == 50) = false
  

運算子優先順序