Languages And Environments

Question 1

What are the main differences between natural languages and programming languages?

Answer 1

Natural languages have more complex syntax rules and can be more ambiguous

Question 2

Why do many types of high level programming language exist?

Answer 2

HLL’s are often written to solve particular types of problem

Question 3

Define sequence

Answer 3

All commands will be executed one after the other unless otherwise directed

Question 4

Define Selection

Answer 4

Lines of code are executed based on whether a condition is true or not

Question 5

Define Iteration

Answer 5

Iteration is when a set of commands is repeated a set number of times. Often known as a loop.

Question 6

What is meant by programming languages being problem oriented?

Answer 6

When code is written with particular people in mind

Question 7

Give two reasons for the development of object-oriented languages

Answer 7

Increasing complexity of programs caused problems in managing and maintaining them

GUI environments cannot be programmed by the constructs of conventional environments

Use of global variables meant that it became more and more difficult to keep errors from occurring where it was changed accidentally

Question 8

Define the term Instance

Answer 8

Each object created during the execution of an object-oriented program
New objects will have a copy of the data required to define the object and may inherit data defined in other classes

Question 9

When is object oriented programming commonly used and why?

Answer 9

In programs which model real-life situations because objects can be created, destroyed and modified just as they would in reality.