Intro to Programming Review: The problem solving phase

In computer program development, there are two phases:

1. Problem Solving Phase
2. Program Implementation Phase

As a beginning programmer, you must understand that the key to writing efficient programs is to master the problem solving phase.

PROBLEM SOLVING PHASE

1. Define the problem
2. Find a solution
3. Evaluate alternate solutions
4. Choose the most efficient solution and write an algorithm
5. Test the algorithm for correctness

To define the problem, a defining diagram is used.  The defining diagram is also known as an IPO table.  It is a three column table that separates the problem into INPUT, PROCESSING, and OUTPUT.

ALGORITHM

An algorithm is a series of instructions that rigorously defines the solution to a problem.

Forms of algorithms:

• Narrative algorithms - written in plain English text
• Pseudocode algorithms - written in English-like text (code) and English
• Flowchart - pictorial representation of an algorithm
• Structured algorithms - written in code; the only executable format of an algorithm

Types of algorithms:

• Simple algorithms
• Conditional algorithms
• Loops
• Arrays

Example of a simple algorithm:

Print "Hello Student"

Print "Hope you're reviewing for your upcoming test"

Print "Kindly enter your name"

Input sname$

Print sname$,"Good luck on your test"

Input key

Having trouble remembering simple algorithms?  Start a discussion in edmodo and ask your peers for help.