Programming Concepts
Übersicht
There is a startling fact hidden in this topic. Every program ever written, from a twenty-line homework exercise to the software flying an aircraft, is built out of three ways of combining statements and nothing else. Do this, then do that. Do this only if something is true. Do this again and again. Sequence, selection and iteration. Everything else is decoration on top of those three.
This lesson takes each of them apart. You will meet variable and constant declaration and learn why a program bothers to name things at all; you will learn assignment properly, including why the left-hand side and the right-hand side of an arrow are not interchangeable; you will learn definite iteration and both shapes of indefinite iteration, with the condition at the start of the iterative structure and with it at the end; you will nest selection inside selection and iteration inside iteration; and you will find out why an examiner cares what you call your variables.
Ziele
- Use, understand and know how the following statement types can be combined in programs:
- variable declaration
- constant declaration
- assignment
- iteration
- selection
- subroutine (procedure/function).
- Use definite and indefinite iteration, including indefinite iteration with the condition(s) at the start or the end of the iterative structure.
- Use nested selection and nested iteration structures. An example of nested iteration would be:
- Use meaningful identifier names and know why it is important to use them.
Mindmap
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- Which three principles are used to combine statements in all imperative programming languages? A. Assignment, declaration and output B. Compilation, interpretation and assembly C. Sequence, selection and iteration D. Variables, constants and subroutines Answer: C
- Which construct is used for definite iteration? A. FOR ... ENDFOR B. IF ... ENDIF C. REPEAT ... UNTIL D. WHILE ... ENDWHILE Answer: A
- Which statement about a REPEAT ... UNTIL loop is correct? A. Its body always runs at least once B. Its body may run zero times C. It runs a number of times known before it starts D. It cannot contain another loop Answer: A
- A FOR loop that runs 6 times contains a FOR loop that runs 5 times. How many times is a statement in the inner loop carried out? A. 11 B. 20 C. 30 D. 36 Answer: C
- Why are named constants used in programs? A. They make the program run faster B. They let a fixed value be changed in one place and cannot be altered by later code C. They use less memory than variables D. They are required by every programming language Answer: B
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