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At this point, you have seen that you can define volume as an
ordinary function with one explicit parameter, a particular
box_car object. You refer to the box_car object's member
variables using class-member operators:
double volume (box_car b) {
return b.height * b.width * b.length;
}
Thus defined, volume is called with an argument that is a
particular box_car object:
volume (x)
You can also define volume as a member-function with no
explicit parameter:
double volume ( ) {
return height * width * length;
}
Remember that, by convention, the member-variable values used in this
definition of volume are the values associated with a particular
box_car object—the one that is identified by the box_car
variable that appears joined, via the class-member operator, to the
function call:
x.volume ( )