i am doing a project with visual c++ .In my project I have 2 forms . I want to do some calculation of some data of the form Form1, and i want the result of this calculation to write to a label of Form2. How to do this?
Hi I'm new at this I have created a database Person with (ID,Name,address) in MS SQL an d I have the following code
protected void Button1_Click(object sender, EventArgs e)
{
System.Data.SqlClient.SqlConnection conn =new System.Data.SqlClient.SqlConnection();
conn.ConnectionString ="integrated security=SSPI;data source=SQL Server Name;" +"persist security info=False;initial catalog=northwind";
try
{
conn.Open();
string sql = "DELETE FROM Person WHERE ID = 4"; //just as an example is number 4 taken
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.ExecuteNonQuery();
cmd.ExecuteScalar();
// Insert code to process data.
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
}
I work with Visual Studio 2005. it runs OK no error message but it does not deletes th Person with ID 4 .
class Base
{
int i;
public Base(int i)
{
this.i=i;
}
public void print()
{
System.out.println("Value of i "+i);
}
}
public class MainClass extends Base
{
int i,k;
public MainClass()
{
super(0);
i=0;
}
public static void main(String[] args)
{
MainClass m=new MainClass();
m.print();
}
}
but this not
class Base
{
int i;
public Base(int i)
{
this.i=i;
}
public void print()
{
System.out.println("Value of i "+i);
}
}
public class MainClass extends Base
{
int i,k;
public MainClass()
{
// super(0);
i=0;
}
public static void main(String[] args)
{
MainClass m=new MainClass();
m.print();
}
}
and the meaning of this is that in this case we must call the base constructor with super() but my question is how in th first class CounterDemo extends Counteexample we do not need super();
I have 2 examples for inheritance in Java The first works but the second not. I wonder why. Does the extended class must implement constructor with super()
class Counter {
int i = 0;
public Counter()
{
i=1;
}
Counter increment() {
i++;
return this;
}
void print() {
System.out.println("i = " + i);
}
}
public class CounterDemo extends Counter{
public static void main(String[] args) {
Counter x = new Counter();
x.increment().increment().increment().print();
}
}
import java.io.*;
class Base
{
int i;
public Base(int i)
{
this.i=i;
}
public void print()
{
System.out.println("Value of i "+i);
}
}
public class MainClass extends Base
{
int i;
public static void main(String[] args)
{
MainClass m=new MainClass();
}
}
in the second example tells that "Cant find symbol constructor Base()"
3 years before I used Borland C++ compiler and their editor to and I didn't have to make new project to compile. I just opened I single Cpp file and click Compile and than Run and everything was OK . I'm interested to, to know how to compile a single .cpp file without making new project in Visual Studio probably it is possible.
