out

So I am new to C# and I am having difficulty understanding out . As opposed to just returning something from a function using System; class ReturnTest { static double CalculateArea() { double r=5; double area = r * r * Math.PI; return area; } static void Main() { double output = CalculateArea(); Console.WriteLine("The area is {0:0.00}", output); } } compare to this using System; class ReturnTest { static void CalculateArea(out double r) { r=5; r= r * r * Math.PI; } static void Main() { double radius; CalculateArea(out radius); Console.WriteLine("The area is {0:0.00}",radius ); Console.ReadLine

I have a method passing a string to a class. For testing reasons I have used a button for now. I have searched in the forum for similar questions but they refer to php and other situation that I am unable to understand. The class strips out few characters from the string and assign the value to 3 different strings depending on the header. I need to return those 3 strings back to the caller and I have coded it as following. Caller: private void button4_Click(object sender, EventArgs e) { string a, b, c; string invia = textBox8.Text.ToString(); Stripper strp = new Stripper(); strp.Distri(invia,

I read the page Passing Arrays Using ref and out (C# Programming Guide) and was wondering why we would need to define an array parameter as a ref parameter when it is already a reference type. Won't changes in the callee function be reflected in the caller function? Jon Skeet Won't changes in the callee function be reflected in the caller function? Changes to the contents of the array would be reflected in the caller method - but changes to the parameter itself wouldn't be. So for example: public void Foo(int[] x) { // The effect of this line is visible to the caller x[0] = 10; // This line is

I'm trying to create a procedure that will enter data and then return a message in the OUT parameter, however i'm getting this message "argument 5 for routine hospital.alextest10 is not a variable or NEW pseudo-variable in BEFORE trigger" i have this as my procedure: create procedure alextest10 (IN a_patid CHAR(3), IN a_patnam VARCHAR(12), IN a_consno CHAR(3), IN a_ward CHAR(2), OUT a_message VARCHAR(50)) BEGIN set a_message = 'Database updated'; INSERT INTO patient (patient_id, patient_name, consultant_no, ward_no) values (a_patid, a_patnam, a_consno, a_ward); end! and this as my call command