# title=Problem Solving: Algorithm design

Jump to navigation Jump to search
 ← Finite state machines Algorithm design 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

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

```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

```x = 0
y = 5
Do
x = x + 1
Loop Until x = y
```

 ← Finite state machines Algorithm design Trace tables →