Structured Programming The Basics. Control structures They control the order of execution What order statements will be done in, or whether they will.

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Presentation transcript:

Structured Programming The Basics

Control structures They control the order of execution What order statements will be done in, or whether they will be done at all (skipping) Different from data structures – which are ways to access data, to operate on it

Why do structured programming? It's easier to understand code written using structured programming Easier to test and debug code Easier to modify and maintain code Easier to work with other people to write large programs

4 Control Structures Sequence Selection Iteration Module

Guarantees for All Structures ONE Entrance ONE Exit

SEQUENCE Statement 1 Statement 2 Statement 3...

Guarantees for Sequences Will execute the steps in the order given Will not enter or leave sequence in mid- stream Will not skip steps

SELECTION(branch) IF Condition THEN Statement1 ELSE Statement2 Statements1 Statement Statements2 Condition... True False

Selection Guarantees Control always enters through the condition / question One branch or the other is executed, never both on one run MUST execute one branch or the other Processes in branches can be as large or small as you want Do not write Dead Code!

Dead Code

LOOP(repetition) Body Condition... False True WHILE Condition DO Statement1

Guarantees Will go through test / condition at top to get into loop ALL of body will be executed before test is done again Body will be repeated until test is answered differently (NO) Do not write Infinite Loops!

SUBPROGRAM(function) SUBPROGRAM1... SUBPROGRAM1 a meaningful collection of SEQUENCES, SELECTIONS, LOOPS, SUBPROGRAM calls

Module Flow of control