Playground 学习编程1-条件代码

第三章｜条件代码

• • 1. 检查开关
  • 2. 使用else if
  • 3. 循环条件代码
  • 4. 满足条件时向上爬
  • 5. 定义更巧妙的函数
  • 6. 围困其中
  • 7. 决策树

1. 检查开关

func moveNext(){
    moveForward()
    moveForward()
}
moveNext()
for i in 1 ... 3{
    if isOnClosedSwitch{
        toggleSwitch()
    }
    moveForward()
}
           

2. 使用else if

for i in 1 ... 2
{
    moveForward()
    if isOnClosedSwitch{
        toggleSwitch()
    }else if isOnGem
    {
        collectGem()
    }
}
           

3. 循环条件代码

for i in 1 ... 12 {
	moveForward()
    if isOnClosedSwitch
    {
        toggleSwitch()
    }else if isOnGem
    {
        collectGem()
    }
}
           

4. 满足条件时向上爬

func turnAround(){
    turnLeft()
    turnLeft()
}
for i in 1 ... 16 {
    if isOnGem {
        collectGem()
        turnLeft()
    } else {
        moveForward()
    }
}
           

5. 定义更巧妙的函数

func collectOrToggle() {
	if isOnGem {
        collectGem()
    } else if isOnClosedSwitch {
        toggleSwitch()
    }
}
func leftNext(){
    turnLeft()
    moveForward()
    moveForward()
    turnLeft()
}
func rightNext(){
    turnRight()
    moveForward()
    turnRight()
}
func runNext(){
    for i in 1 ... 2 {
        moveForward()
        moveForward()
        collectOrToggle()
    }
}
runNext()
leftNext()
runNext()
rightNext()
runNext()
           

6. 围困其中

func collectOrToggle() {
    if isOnGem {
        collectGem()
    } else if isOnClosedSwitch {
        toggleSwitch()
    }
}
func turnNext() {
    for i in 1 ... 2{
        collectOrToggle()
        moveForward()
    }
}
func oneNext() {
    moveForward()
    turnLeft()
    collectOrToggle()
    moveForward()
    turnLeft()
}
oneNext()
for j in 1 ... 4 {
    turnNext()
    turnLeft()
}
           

7. 决策树

func collectOrToggle() {
    if isOnGem {
        collectGem()
    } else if isOnClosedSwitch {
        toggleSwitch()
    }
}
func turnAround() {
    turnLeft()
    turnLeft()
}
func oneNext() {
    turnRight()
    moveForward()
    moveForward()
    moveForward()
    turnLeft()
    moveForward()
    collectOrToggle()
}
func twoNext() {
    turnAround()
    moveForward()
    turnRight()
    moveForward()
    moveForward()
    moveForward()
    turnRight()
}
func threeNext() {
    moveForward()
    collectOrToggle()
    turnLeft()
    moveForward()
    collectOrToggle()
    turnAround()
    moveForward()
    turnLeft()
}
for i in 1 ... 2 {
    moveForward()
    collectOrToggle()
    oneNext()
    twoNext()
    threeNext()
    moveForward()
}