IOS 打印素数与计算天数

//
 //  ViewController.swift
 //  LearnSwift
 //
 //  Created by ym on 15/12/24.
年
 //
 
import
 
class ViewController:  UIViewController
 
override func
super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
         
         
        //Blow add by ym on 2015.12.24
        //Project:杨闽的swift秒学作业
         
        print("1:打印101到200之间的素数")
         
         
for  var i = 0;i<=200;i=i+1
         {
             
for  (var n = 2;n<=i-1;n=n+1)
             {
if(i%n==0)
                 {
// print("数：\(i)")
break  //continue
                 }
                 
if(n>=i-1)
                 {
print("素数：\(i)")
                 }
  
              }
 
         
          }
         
print("2:条件运算符嵌套")
         
var arrnum:[Int] = [98,95,30,83,70,65,50,-20]
         
for var j = 0; j < arrnum.count; j++ {
            //print(arrnum[j])
             
switch
case 90 ... 100:
print("A")
case 60 ... 89:
print("B")
default:
print("C")
             }
             
         }
         
        print("3:判断一年中第几天")
let zyear =  2015
let zmonth =  12
let zday =  24
         
var days =  30
var daynum =  0
for var k = 1; k < zmonth; k++ {
             
switch
case 1,3,5,7,8,10,12:
31;
                 
case 4,6,9,11:
30;
                 
case 2:
if ((zyear %  400 == 0) || ((zyear %  4 == 0) && (zyear %  100 != 0))) {
29;
else{
28;
                 }
default
0
             }
             
             daynum += days;
             
         }
//
         daynum = daynum + zday
print("这是一年中的第：\(daynum) 天")
        
        //Up add by ym on 2015.12.24
    
         
   }
 
override func
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
     }
 
 
 }