Functions

• statements, variables, loops and branching are all primitive.
• What you spend most of your time doing is writing functions.
• They use the primitives and call other functions.
• You can call them functions, methods, or procedures.
• public int sum(int i, int j) {
int result = i + j;
return result;
}
• You need to name the function (sum).
• It has a parameter list (which may be empty). In this case it's i and j.
• If you want a return value, you need to say the type (in this case int).
• If you don't want a return value, the type is void.
• If you have a return value, you need to return on all paths through the function. (That's the return statement. Hey another type of statement).
• Functions should be relatively small. They should fit on one page or less.