programming-for-dummies

552
Creating Functions
If the condition is True, the loop runs at least once. If this condition is
False, the loop doesn’t run.
A variation of the WHILE loop is the DO-WHILE loop, which looks like this:
do {
Command;
} while (condition);
The main difference between the two loops is that the WHILE loop may run
zero or more times, but the DO-WHILE loop will always run at least once.
Somewhere inside a WHILE and DO-WHILE loop, you must have a command
that can change the condition from True to False; otherwise, the loop will
never end, and your program will appear to hang or freeze.
Creating Functions
In Java/C#, every subprogram is a function that can return a value. The
format of a typical Java function looks like this:
Datatype functionname (Parameter list)
{
Commands;
Return value;
}
The three parts of a C/C++ function are
✦ Data type: Defines the type of value the function returns, such as an
integer (int) or floating point number (float). If you define the data
type as void, then the function doesn’t return a value.
✦ Parameter list: Defines any data and their data types that the function
needs to work.
✦ Return: Defines a value to return. This value must be the same data type
specified right before the function name.
If a function doesn’t return a value or require any data, it might look like this:
void myfunction ()
{
Command;
}