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A function is like a procedure except that it always returns a value.
Parameters are variables that allow you to send data to the function to customise what it does or how it works.
The parameters are the variables named in brackets after the function name.
This return value is calculated when the function is called and can be saved into a variable or used later in the program.
Both functions and procedures are sections of code that have been given a name, which can be re-used to do something useful.
This example defines a function which will generate and return a random number. It has two parameters which allow you to set the minimum and maximum number the random number will be between.
This function is called to choose a random number between 10 and 20 and then called again to choose a random number between 50 and 100. Both numbers are returned and saved into separate variables.