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I need help with this c++ error please

owmn (30)
So basically I have this c++ assignment for school where I need to write a recursive function, called sumDigits, that takes an integer as a parameter and returns the sum of the digits of the integer, but this error keeps popping up for me: functions.cpp:9:5: error: expected initializer before ‘if’
if (num != 0)

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//In my funtions.cpp file

#include <iostream>

using namespace std;

inline void sumDigits(long long& sum, long long num)
{
int sum (int num)

    if (num != 0)
    {
        return (num % 10 + sum (num / 10));
    }
    else
    {
       return 0;
    }
}


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//In my main.cpp file

#include <iostream>
#include "functions.cpp"

using namespace std;

int main()
{
    long long num = 930567829100185;
    long long sum = 0;

    sumDigits(sum, num);

    cout << "The sum of the digits of " << num << " is: " << sum << endl;

    return 0;
}
ne555 (10692)
¿what's the purpose of line 9? int sum (int num)
owmn (30)
Line 9 holds the purpose of summing integers.
salem c (3700)
But line 9 looks like you're trying to define a function called sum, when you're already in the middle of defining a function called sumDigits.

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inline void sumDigits(long long& sum, long long num)
{
    if (num != 0)
    {
        // The sum is in the reference parameter.
        sum += num % 10; 
        sumDigits(sum,num / 10));
    }
}


Contrast this with returning a value.
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inline long long sumDigits(long long num)
{
    if (num != 0)
    {
        return num % 10 + sumDigits(num / 10));
    }
    else
    {
        return 0;
    }
}



owmn (30)
@salem c

Thank you so much! This worked perfectly!
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