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software development (procedures and functions (procedures (procedures…
software development
procedures and functions
procedures
procedures have a heading , a declaration part and an action part
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functions
functions also contain a heading, a declaration part and an action part
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variables
global variables
a global variable can be accessed and altered from any part of the program, even from another script as long as it is declared at the very start
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local variables
it prevents them from being used elsewhere in program, prevents them from having their contents changed
the same variable name can be used more than once in different parts of program, they aid modularity