This is an example:
You will define your function with the arguments and then you will evaluate it adding the value of the arguments.
Hope enjoy! 
I explained some code from this source:
http://pythoncentral.io/pythons-range-function-explained/
Here is the link to my video:
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Here’s an example of a function called sum which adds two given values by the user. Pay attention and check that you declare what kind of function is, in this case x and y are integer values.
After creating your function int (Which stands for only integer values) in order to call it and execute you’ll need to create your main function where the whole code takes its place.
As you can see immediately after creating the main function you must declare the variables you’ll use (x and y) and ask them to the user.
Then when both values are given you must call the function you’d like to execute by it’s name in this case sum (x,y) also specifying the values you’ll use. And that’s it, you’ve just created and called a function.
Calling C++ functions
Creating C++ functions
