2.2 - Programming Techniques

Variables
1. Should not contain spaces and they shouldn't start with a number.
2. If the inputs come from the console, from a file or from elsewhere in a modular program.
  1. AKA parameters.
3. Booleans
  1. And, or, not, larger, smaller, equal, not equal.
4. String/characters
  1. Slicing, length, format.
5. Modular division
  1. Finding a remainder.
  2. 5MOD2 would give 5.
6. Integer division
  1. 5DIV2 would give 2
7. Stores values whilst a program is running.
8. Values can change.
String Features
1. Slicing
  1. LEFT("Monkey") gives "Monk"
2. Length
  1. LEN("Monkey") gives 6
3. Change case
  1. Monkey ---> MONKEY ---> monkey
Sequencing
1. Allows a programmer to solve complex tasks through a number of simple steps.
2. Benefits
  1. Each line follows the next.
  2. Creates simple programs very quickly.
  3. Easy to follow for a small program.
  4. Fundamental principals of a program.
    1. Starts at the top, finishes at the bottom.
3. Disadvantages
  1. Not at all efficient.
  2. Becomes very difficult to follow with large programs.
  3. Extremely hard to maintain.
Selection
1. Changes the flow of a program, depending on a set of decisions.
2. Used for validation, calculation and making sense of a user's choices.
3. Nested Selection
  1. A statement within a statement.
Constants
1. Store values whilst program is running.
2. Values remain the same.
Basic Programming Constructs
1. Sequence
2. Selection
3. Iteration
2 dimensional array
1. Has rows and columns.
2. Each row/column/index holds data.
Features of a table
1. Fieldname
  1. Title of each column.
2. Primary Key
  1. A unique number to identify an object.
3. Record
  1. Each individual cell's data.
Subroutines
1. Can be repeated in different parts of code.
2. Work can be split between programmers.
3. Functions return a value.
4. Procedures DO NOT return a value.

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2.2 - Programming Techniques

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	Created by Sam Haynes over 6 years ago