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Lesson 2 Traditional approach/ Procedural Programming
Objective Procedural programming and how it is used.
Prior to the rise of object-oriented programming, the most popular approach was procedural, or structured, programming. Structured programming uses top-down design to decompose a problem into a series of successively more granular functions.
Structured programming requires well-defined flow control. Languages that support this are often called procedural languages because of their heavy reliance on procedures.
Development begins by identifying the problem domain-defining what the problem is that your project is supposed to help solve. This is the case whether you use a procedural or an object-oriented design. Once the problem domain has been identified, however, the two methods diverge. Procedural designs begin by defining the procedures, starting with a top-level function. From there, the problem is broken into more specific procedures.
Object-Oriented Analysis and DesignObject-Oriented Analysis and Design

For example, a program that converts GIF files to JPEG files might begin with a single function called convertImage().
This function is then broken down into three functions called
In turn, each of these functions can be broken down even further.
Procedural programming refers to a programming paradigm derived from structured programming which is based upon the concept of the procedure call.
Procedures, also known as
  1. subroutines,
  2. methods, or
  3. functions
simply contain a series of computational steps to be carried out. Any given procedure might be called at any point during a program's execution, including by other procedures or itself. A list of instructions telling a computer what to do, usually having a linear order of execution from the first statement to the second occasional loops and branches. Procedural programming languages include C, C++, Fortran, Pascal, and BASIC.