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You define the box_car_volume function as follows:
int box_car_volume (int h, int w, int l) {
return h * w * l;
}
Here is what each part of a function definition does:
*--Tells C++ the data type of the returned value
| *-- Tells C++ the name of the function
| | *-- Tells C++ the names of the
| | | parameters along with their
| | | data types
v v v
--- -------------- ---------------------
int box_car_volume (int h, int w, int l) { <-- Marks where
return h * w * l; the body begins
------ ---------
^ ^
| |
| *-- The expression whose value is to be returned
*-- Indicates that a value is to be returned by the function
} <-- Marks where the body ends