. NET Study notes----2015-07-10 (Basic review and Exercise 09)

1. Please set the string array {" China ", " USA ", " Brazil ", " Australia ", " the content in Canada "} is reversed. Then output the inverted array. The Reverse () method of the array cannot be used .

        Static voidMain (string[] args) {            string[] STRs = {"China","United States","Brazil","Australia","Canada","Spain" }; //first and last swap//Exchange STRs. LENGTH/2 Times             for(inti =0; I < STRs. Length/2; i++)            {                stringtemp = Strs[strs. length-1-i]; Strs[strs. Length-1-I] =Strs[i]; Strs[i]=temp; }             for(inti =0; I < STRs. Length; i++) {Console.Write (Strs[i]+" ");        } console.readkey (); }

2. Create a person class, attribute: Name, gender, age; Method:sayhi () . Create an Employee class to inherit the person class, extend the property Salary, override Sayhi method.

Parent class:

    classPerson { Public stringName {Get; Set; }         Public intAge {Get; Set; }         Public CharGender {} Public Virtual voidSayhi () {Console.WriteLine ("I'm the sayhi of the Father's class."); }    }

Sub-class:

 class   Employee:person { 
   
    public  
    double  
     Salary {
    get  
    ;         
    set  
    ;  
    public  
    override  
    void  
     Sayhi () {Console.WriteLine ( 
     " 
     subclass Overrides parent class  
    "  
            ); }    }
   

Using the WinForm form, make a simple calculator, which defaults to "Please select". Requires a +,-,*,/ function, when the user clicks the "equals" button, if the input is not a number prompts the user:

     Public Partial classForm1:form { PublicForm1 () {InitializeComponent (); }        Private voidForm1_Load (Objectsender, EventArgs e) {Combobox1.selectedindex=0; }        Private voidbtnStart_Click (Objectsender, EventArgs e) {            Try            {                intN1 =Convert.ToInt32 (TextBox1.Text.Trim ()); intN2 =Convert.ToInt32 (TextBox2.Text.Trim ()); stringOper =comboBox1.SelectedItem.ToString (); Switch(oper) { Case "+": Label1. Text = (N1 +n2).                        ToString ();  Break;  Case "-": Label1. Text = (N1-n2).                        ToString ();  Break;  Case "x": Label1. Text = (N1 *n2).                        ToString ();  Break;  Case "/": Label1. Text = (N1/n2).                        ToString ();  Break; default: MessageBox.Show ("Please select the correct operator");  Break; }            }            Catch{MessageBox.Show ("Please enter the correct number"); }        }    }

. NET Study notes----2015-07-10 (Basic review and Exercise 09)