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16553869
Unit 2.2 - Programming Techniques
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Year 10 Computing Mapa Mental sobre Unit 2.2 - Programming Techniques, criado por Dan Roberts em 27-01-2019.
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computing
year 10
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Dan Roberts
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Unit 2.2 - Programming Techniques
Sequencing
Allows a programmer to solve complex tasks through a number of simple steps
Each line follows the next
Creates simple programs very quickly
Easy to follow for a small program
Fundamental principal of a program
Not efficient
Becomes very difficult to follow with large programs
Hard to maintain
Selection
Allows a computer to make decisions
Changes the flow of a program depending on a set conditions
Used for validation, calculation and making sense of a user's choice
Nested Selection
Only evaluates a condition if pre-conditions are met
There is no limit on how many selection statements we can nest
The outside selection is the pre-condition and the inside is the condition
An array up to 2D to a file
Iterate through an array using WRITELINE and writing elements to the file one by one
Serialise the array (convert to a string) using delimiters e.g. commas for columns and NewLines for rows in case of a 2D array
Uses numeric index not names
Array: An ordered collection of related data where each element is accessible by a number index
SQL (Standard Query Language)
A popular readable programming language
Used to work with databases stored in binary proprietary formats e.g. Oracle, MySQL
Purpose of SQL S-Search C-Create R-Read U-Update D-Delete
SELECT, FROM, WHERE
Variables
A "variable" is a memory location that changes throughout the program
A "constant" is a memory location that is fixed for the duration of the program
"Assignment" is labelling various inputs, constants and outputs with descriptive names
Information is stored in memory locations under descriptive names called "identifiers"
"Concatenation" is joining inputs/text variables together
"Parameters" are inputs coming from the console, from a file or from elsewhere in a modular program
Operators
Boolean - An outcome of one of two values
String - A sequence of characters
Concatenate - Join Together
Substring - A smaller part of a string
Delimiter - One or more characters that separates a string
Iteration
"Iteration" is when loops run similar types of data
A "For Counter" is a loop for when we know how many times we want something to loop so we use a counter
"Stepping" is when we skip or miss out when counting
A "While Loop" is used for validation and searching. Evaluates a boolean everytime they run
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