17: Modules
- Page ID
- 54226
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For larger programs, using a single source file for the entire program becomes more difficult. Fortunately, large programs can be split into multiple source files, each file can contain a subset of subroutines and/or functions. There must be a main or primary source file that includes the main program. The secondary file or files is referred to as a module or modules. Additionally, the modules can then be more easily used in other, different programs ensuring that the code can be easily re-used. This saves time and money by not re-writing routines. This section provides a description of the formatting requirements and an example of how to set-up the modules.
- 17.1: Module Declaration
- The secondary source file or module must be formatted in a specific manner.
- 17.2: Use Statement
- Once the module is defined, the routines from the module can be included by using the use statement.
- 17.3: Updated Compilation Commands
- For a large program that is split between multiple source files, the compilation process must be updated. The compilation process refers to the steps required to compile the program into a final executable file.
- 17.4: Module Example Program
- The following is an example program to compute the surface area and volume of a sphere.