Glossary

• constant: a symbolic name with an associated value which cannot be altered by the program during normal execution – the value is constant
• parameter: a special kind of variable, used in a subroutine to refer to one of the pieces of data provided as input to the subroutine. Also known as: arguments
• subroutine: a sequence of program instructions that perform a specific task, packaged as a unit. Also known as: procedure, function, routine, method or subprogram.
• variable: a symbolic name associated with a value and whose associated value may be changed

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Most definitions taken from Wikipedia