Swift Learning-use if and switch to perform conditional operations, use For,while, and Do-while to cycle (iii)

Swift Learning-use if and switch for conditional operation, use For,while, and do-while to cycle

//switch supports arbitrary types of data and a variety of operations- - not only integers, but also test equivalence

// Note that if you remove the default program, you will get an error

Let strings = ' hello3 ' switch strings{case    ' hello1 ': let    stringscomment = ' say Hello1 '    println (" Stringscomment is \ (stringscomment) ") Break case    " Hello2 "," Hello3 ": let    stringscomment =" Say Hello2 and Hello3 "    println (" Stringscomment is \ (stringscomment) ") The break case let    x where X.hassuffix (" Hello4 "): Let    stringscomment = "is it a spicy \ (x)?"
"    println (" Stringscomment is \ (stringscomment) ")    break    default: let    stringscomment =" Say Everything "    println (" Stringscomment is \ (stringscomment) ")}

Simple while and do-while loops

While loop var n = 3while N < 100{    n = n*2}println ("N is \ (n)")//do-while cyclic var m = 3do{    m = m*2}while m < 1 00println ("M is \ (m)")

Print results

Stringscomment is say Hello2 and Hello3

N is 192

M is 192

Swift Learning-use if and switch to perform conditional operations, use For,while, and Do-while to cycle (iii)