A-level Computing 2009/AQA/Problem Solving, Programming, Data Representation and Practical Exercise/Problem Solving/Algorithm design

Finite state machines Trace tables Algorithm a set of instructions independent of any programming language that calculates a function or solves a problem. Express the solution to a simple problem as an algorithm using flowcharts, pseudo-code or structured English and the standard constructs: Sequence thumb|center performing or operating each step consecutively in the order they arise Console.writeline("This is line 1") Console.writeline("This is line 2") Console.writeline("This is line 3") Assignment Assigning a value to a variable Dim x, y, sum as integer x = 5 y = 15 sum = x + y Selection Selection is choosing a step center|thumb If x > 0 then Console.writeline("x is positive") End If If x = 0 then Console.writeline("x equals 0") End If If x < 0 then Console.writeline("x is negative") End If Repetition A sequence of steps that loop until a requirement is met center|thumb center|thumb center|thumb x = 0 y = 5 Do x = x + 1 Loop Until x = y Finite state machines Trace tables