Swift For-in循環(huán)

Swift的For-in循環(huán)用于運行一組任務一定次數(shù)。愛掏網(wǎng) - it200.com這個循環(huán)會重復執(zhí)行一定次數(shù)的過程。愛掏網(wǎng) - it200.com

示例

如果你想編寫一個語法來打印”Hello JavaTpoint”，簡單的語法將是:

print("Hello JavaTpoint") 

如果你必須寫相同的打印語句5次會怎樣？簡單的解決方案是：

print("Hello JavaTpoint") 
print("Hello JavaTpoint") 
print("Hello JavaTpoint") 
print("Hello JavaTpoint") 
print("Hello JavaTpoint") 

但是，有一個解決方案。愛掏網(wǎng) - it200.com您可以使用for-in循環(huán)來打印相同的語句，并使代碼更簡短。愛掏網(wǎng) - it200.com

for i in 1...5 {
//It will print Hello JavaTpoint for 5 times on the screen
print("Hello JavaTpoint")
}

示例1：

let names = ["Ajeet", "Aryan", "Ayan", "Alex"]
for name in names {
    print("Good Morning \(name)")
}

輸出：

Good Morning Ajeet
Good Morning Aryan
Good Morning Ayan
Good Morning Alex

一個用Swift編寫的程序，打印特定數(shù)字的表格（這里是5）。愛掏網(wǎng) - it200.com

for index in 1...10 {
    print("\(index) times 5 is \(index * 5)")
}

輸出：

1 times 5 is 5
2 times 5 is 10
3 times 5 is 15
4 times 5 is 20
5 times 5 is 25
6 times 5 is 30
7 times 5 is 35
8 times 5 is 40
9 times 5 is 45
10 times 5 is 50