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A program module is represented in a fowchart by rectangle with some lines to distinguish it from process symbol. Often programmers will make a distinction between program control and specific task modules as shown below.
      Note: C++ equivalent is the function.
    
    Local module: usually a program control function.
      
        Figure 10.7 Rectangle with a line
      
      
    Library module: usually a specific task function.
      
        Figure 10.8 Rectangle with some lines
      
      
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