programming-for-dummies

Data Structures 535
If a function doesn’t return a value or require any data, it might look like this:
void myfunction ()
{
Command;
}
If the function needs to return an integer value, it might look like this:
int myfunction ()
{
Command;
return value;
}
Book VI
Chapter 1
C and C++
In the preceding example, value represents any integer value.
To accept data, a function needs a parameter list, which simply lists a variable
to hold data along with its specific data type, such as an integer or character.
To create a function that accepts an integer and a character, you could do
something like this:
int myfunction (int mynumber, char myletter)
{
Command;
return value;
}
The preceding function accepts two values by value, so the function can
change the values of variables in its parameter list, but those changed values
won’t appear outside that function.
If you want a function to change the values of its parameters, you need to
define a parameter list by identifying which variables accept values by reference.
To identify values passed by reference, use the & sign, such as
int myfunction (int& mynumber, char myletter)
{
Command;
return value;
}
Data Structures
Many C/C++ compilers include libraries that offer data structures, such as
stacks or collections. However, three built-in data structures of C/C++ are the
structure (sometimes called a record in other programming languages), enumerated
variables, and the array.