タグ: 算術演算子

// +=
var a = 1
a += 1
print(a) //2

//複合代入演算子を使わなかった場合
a = a + 1

// -=
var b = 2
b -= 1
print(b) //1

//複合代入演算子を使わなかった場合
b = b - 1

// *=
var c = 2
c *= 2
print(c) //4

//複合代入演算子を使わなかった場合
c = c * 2

// /=
var d = 4
d /= 2
print(d) //2

//複合代入演算子を使わなかった場合
d = d / 2

// %=
var e = 5
e %= 2
print(e) //1

//複合代入演算子を使わなかった場合
e = e % 2

let one = 1 //Int
let two = 2
let three = 3
let four = 4
let five = 5
let six = 6
 
var answer = one + two //演算した結果をanswerに代入

print(answer) //3
print(type(of: answer)) //Int

let one = 1 //Int
let two = 2
let three = 3
let four = 4
let five = 5
let six = 6

var answer2 = four - three

print(answer2) //1
print(type(of: answer2)) //Int

let one = 1 //Int
let two = 2
let three = 3
let four = 4
let five = 5
let six = 6

var answer3 = five * six

print(answer3) //30
print(type(of: answer3)) //Int

let one = 1 //Int
let two = 2
let three = 3
let four = 4
let five = 5
let six = 6

var answer4 = six / three

print(answer4) //2
print(type(of: answer4)) //Int

//Int型の演算する際、割り切れない割り算は少数が切り捨てられる
var answer5 = five / two

print(answer5) //2
print(type(of: answer5)) //Int

//小数点以下も扱う場合はFloat型かDouble型で宣言しましょう
let floatFive:Float = 5
let floatTwo:Float = 2

var answer6 = floatFive / floatTwo

print(answer6) //2.5
print(type(of: answer6)) //Float

let one = 1 //Int
let two = 2
let three = 3
let four = 4
let five = 5
let six = 6

var answer7 = three % two
print(answer7) //1
print(type(of: answer7)) //Int
//3を2で割ると1余るので剰余は1になります
//剰余はInt型以外で演算しようとするとエラーになります