// for in 循环

var sum = 0

for k in 1...10

{

sum = sum + k

}

print(sum)

for a in [1,2,3,4,5]

{

print(a)

}

print("----------->")

for k in [1:"1",2:"2",3:"3"]

{

print(k)

}

print("----------->")

for (a,b) in [1:"1",3:"3"]

{

print("元组=\(a,b)")

}

print("----------->")

// swift 好像不可以这样子了

// for a in "hello world"

// {

// print(a)

// }