When a parameter is passed into a method, it can be passed in one of three ways:
- By value (this is the default): Think of these as being in-only
- By reference as a
refparameter: Think of these as being in-and-out - As an
outparameter: Think of these as being out-only
In the Person class, add the following method:
public void PassingParameters(int x, ref int y, out int z)
{
// out parameters cannot have a default
// AND must be initialized inside the method
z = 99;
// increment each parameter
x++;
y++;
z++;
} In the Main method, add the following statements to declare some int variables and pass them into the method:
int a = 10;
int b = 20;
int c = 30;
WriteLine($"Before: a = {a}, b = {b}, c = {c}");
p1.PassingParameters(a, ref b, out c);
WriteLine($"After: a = {a}, b = {b}, c = {c}"); Run the application and see the output:
Before: a = 10, b = 20, c = 30
After: a = 10, b = 21, c = 100