A Level Computer Science Paper 1: 1.2.4 Types Of Programming Language

A philosophy, style or general approach to writing code

A series of instructions that tell the computer exactly how to deal with a program and deal with a problem

Structured, procedural and object-oriented

A series of procedures or functions that can be reused split a large program into manageable chunks

The user inputs the desired result but not how to get there and the computer does the work
Sets rules and answers questions

Expresses the logic of a computation without expressing its control flow
Defines a set of facts and rules based on the problem

Medical diagnosis, oil exploration, processing natural language

Different for every type of processor
Assembler translates to machine code for execution
Each has it’s own instruction set called an instruction set architecture

The addressing mode, clarifies what the operand means

Only has 11 instructions

The imaginary computer it runs on has only 100 memory locations (7 bits)

Adds the contents of the memory address x to the value in the accumulator

Subtracts the contents of the memory address x from the value in the accumulator

Stores the value in the accumulator in the memory address x

Loads the value in the memory address x to the accumulator

Stops the program

Allows the user to input a value to the accumulator

Outputs the value in the accumulator to the screen

Branch if the contents of the accumulator equal 0

Branch if the contents of the accumulator are greater than or equal to 0

Branch always

You make a branch name after the BRA/BRP/BRZ and call it before a line to show where you skip to

Creates a variable using variablename DAT

The operand holds an actual value

The operand holds the address of the value

The location holding the address of the value

The address of the operand is obtained by adding the value to a base address which is stored in the input register. Used for accessing an array whose elements are in successive memory locations

myFile = openRead("filename.txt")
line = myFile.readLine()
myFile.close()

myFile.endOfFile()

myFile = openWrite("filename.txt")
myFile.writeLine("text to write")
myFile.close()