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In your original program, calculateCharges appeared to be in a reasonable place. I'm not sure why you had it there twice.

I'm not sure why you put "cin >> car1 >> calculateCharges(car1 ,b);"...

calculateCharges(double b, double c, double a);

You don't seem to be passing any values here. It should be something like:

calculateCharges(hours, b, a)

and you don't need the 'double'...