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Having trouble with functions

enigmaterror (15)
Hello I'm trying to write a program that computes miles per gallon by,writing a function that computes miles per gallon a sample output of this goes like this
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  **** Welcome to MPG converter ****

 How many liters did your car consume: 5.0
 How many miles did your car travel:   21.0

 ==> Your car delivered 15.90 miles per gallon (MPG).

     Do you want to continue (y/n)? y

 How many liters did your car consume: 5.0
 How many miles did your car travel:   26.3

 ==> Your car delivered 19.91 miles per gallon (MPG).

     Do you want to continue (y/n)? n

**** Thank you !!! ****


now the code that I have at the moment is like this
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 #include <iostream>
using namespace std;

const double gpl = 0.264179; //gallon per liter.

//prototype
double computeNumMPG();

int main()
{
    cout << "**** Welcome to MPG converter ****\n\n";

    double liters;
    double miles;
    double gallons;

    cout << "How many miles did your car travel: ";
    cin >> miles;

    double mpg;
    gallons = copmuteNumMPG();
    mpg = miles / gallons;

    cout << "==> Your car delivered " << mpg << " miles per gallon (MPG).\n\n";

    //system"pause";
    return 0;
}

int computeNumMPG()
{
    double liters;
    double gallons;

    cout << "How many liters did your car consume: ";
    cin >> liters;
    
    gallons = gpl * liters;

  return gallons;
}

i am aware that there is an error with the code, that is the problem i have, I'm not quite sure what I'm doing wrong or what I'm doing wrong. Thank you if anyone wants or can help me I would appreciate it.
jsmith (5804)
Your prototype on line 7 does not match line 30.
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