iOS 开发 -- Swift 语法篇 (四) 循环

for 循环

var sum = 0
for var i = 0; i < 10; i++ {
sum += i
}
print(sum)

for-in

0..<10

sum = 0
for i in 0..<10 {
sum += i
}
print(sum)

0...10

sum = 0
for i in 0...10 {
sum += i
}
print(sum)

..<

...

Range

for 变量 in 范围 { // 代码 }

_

_

for _ in 0...10 {
print("hello")
}