Frustrating Error Message!!! (for a function)

Code:

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#include<stdio.h>
double marks [20][2];
double averageMark (double marks[20][2], int numMarks);
#define LIMIT 100
void main()
{
        int i=0;
        int count=0;
        double marks[20][2];
        int numMarks;
        double average;

        printf("\nPlease enter the mark (-ive to end entry): ");       
        scanf("%lf", &marks[i][0]);
        if (marks[i][0] > LIMIT)
        {
                printf("\nPlease enter only numbers between 0 and 100");
                printf("\nPlease enter the mark (-ive to end entry): ");       
                        scanf("%lf", &marks[i][0]);
        }

        while (i < 20 && marks[i][0] >= 0)
        {
                i++;

                printf("\nPlease enter the mark (-ive to end entry): ");
                        scanf("%lf", &marks[i][0]);
                if (marks[i][0] > LIMIT)
                {
                printf("\nPlease enter only numbers between 0 and 100");
                printf("\nPlease enter the mark (-ive to end entry): ");       
                        scanf("%lf", &marks[i][0]);
                }

        }

        count = i;
        i--;
        numMarks = count;

                printf("\nYou've entered %d marks", numMarks);

                average = averageMark (marks, numMarks);
               
               
                getchar();

       
}

double averageMark (double marks[][1],int num)
{
        double totalofmarks = 0.0;
        double average;
        int i=0;
        while (i < (num-1) || i == (num-1))
        {
                totalofmarks += marks[i][0];
                i++;
        }
        return(totalofmarks/num);

}

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I keep getting an error message that reads: 1>Lab7_Lab8_Arrays_Sorting.obj : error LNK2019: unresolved external symbol "double __cdecl averageMark(double (* const)[2],int)" (?averageMark@@YANQAY01NH@Z) referenced in function _main
1>C:\Users\Andrew\Documents\Visual Studio 2005\Projects\Assign_6Arrays\Debug\Assign_6Arrays. exe : fatal error LNK1120: 1 unresolved externals

Any help would be greatly appreciated...

Code:

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double averageMark (double marks[20][2], int numMarks);
double averageMark (double marks[][1],int num)

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Quote:

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Originally Posted by Holtzy

Code:

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double averageMark (double marks[20][2], int numMarks);

double averageMark (double marks[][1],int num)

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You've got to pick one: either averageMark takes a 20 by 2 array, or an x by 1 array.

Thanks very much for the help. It worked without a hitch. I was going crazy there!!!

Best of luck!!