### Writing Function Definitions (Checking Correctness)

Just a few short questions. I'm writing two function definitions, but I'm not quite clear as to what that means. The first one is writing a function definition called even that takes one argument (as an int) and returns a bool value. The fiction returns true if one argument is an even number, otherwise it returns false.

The second is a function for isDigit that takes an argument (as a char) and returns a bool value. It returns true if the argument is a decimal digit, and false if not.

What does it mean by a function definition? How do I go about writing these? Thanks for any help.
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What I ended up with the first one is:
 ``12345678`` ``````bool even(int num){ if(num % 2 == 0){ return true; } else{ return false; } }``````

Does this make sense?
My answer for the second is:
 ``123456789`` ``````bool isDigit(char num) { if(floor(num) != num){ return true; } else{ return false; } }``````

Sound right?
You don't need the excessive if/else in this case - for instance, with the first one, you can simply
`return num % 2 == 0;`, and similar for the second.

Your solution to the second one doesn't seem right - floor will convert floats/doubles to integers by chopping off the decimal place. I think you mean to compare if the character is between the character values '0' and '9'.
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How about you test these with actual data. Did you do that already?
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