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/* *
* F i l e : s t a c k . s w i f t
* C r e a t e d T i m e : 2 0 2 3 - 0 1 - 0 9
* A u t h o r : n u o m i 1 ( n u o m i 1 @ q q . c o m )
*/
@ main
enum Stack {
/* D r i v e r C o d e */
static func main ( ) {
/* 初 始 化 栈 */
// S w i f t 没 有 内 置 的 栈 类 ， 可 以 把 A r r a y 当 作 栈 来 使 用
var stack : [ Int ] = [ ]
/* 元 素 入 栈 */
stack . append ( 1 )
stack . append ( 3 )
stack . append ( 2 )
stack . append ( 5 )
stack . append ( 4 )
print ( " 栈 stack = \( stack ) " )
/* 访 问 栈 顶 元 素 */
let peek = stack . last !
print ( " 栈顶元素 peek = \( peek ) " )
/* 元 素 出 栈 */
let pop = stack . removeLast ( )
print ( " 出栈元素 pop = \( pop ) ，出栈后 stack = \( stack ) " )
/* 获 取 栈 的 长 度 */
let size = stack . count
print ( " 栈的长度 size = \( size ) " )
/* 判 断 是 否 为 空 */
let isEmpty = stack . isEmpty
print ( " 栈是否为空 = \( isEmpty ) " )
}
}
