There's no return statement in the occur function - looks like you meant to return an integer value?
Doesn't look like it's getting into the while loop. cin stops at blank spaces. If you want someone to be able to enter more than one word - check into using getline instead of cin.
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I don't know what to say, I have rosy cheeks now (for the
return statement. As for the second point, I currently don't need to be able to input string with whitespace...