2d arrays, calling function problems

Question

I'm doing a task, and I'm having some problems, so help please, u kind people :D I need to create function that allows input for student grades. In that function, I need to allow only input for 6-10 (passing grades). Then, I need to make a function that calculates lowest grade for student. And, in the end, need to make a function that calculates average grade per student. PS : Maybe my ideas are wrong, or u would to something different or better, say it please, I wanna learn. Thanks in advance.

Here is my code and errors :

#include <iostream>
using namespace std;
int input (int [][4], int);
int average (int [][4], int);
int min (int [][4], int);
int main ()
{
 const int wdth = 5;
 int matrix[4][4];
 input (matrix [4][4], wdth);
 average (matrix [4][4], wdth);
 min (matrix [4][4], wdth);
return 0;
}
int input (int matrix[][4], int wdth)
{
 for (int i = 0; i < wdth; i ++)
 {
 cout<<"Enter grades for "<<i+1<<" student:"<<endl;
 for (int j = 0; j < wdth; j ++)
 {
 cin>>matrix[i][j];
 if ((matrix[i][j] < 6) || (matrix[i][j] > 10))
 {
 cout<<"INVALID INPUT!"<<endl;
 return 0;
 }
 //cout<<setw(5);
 cout<<matrix[i][j];
 }
 cout<<endl;
 }
 return 0;
}
int average (int matrix[][4], int wdth)
{
 int sum = 0;
 int avrg = 0;
 for (int i = 0; i < wdth; i ++)
 {
 cout<<"Calculating average for "<<i+1<<" student: "<<endl;
 for (int j = 0; j < wdth; j ++)
 {
 sum = sum + matrix[i][j];
 }
 }
 avrg = sum / 5;
 return 0;
}
int min (int matrix[][4], int wdth)
{
 int temp = 0;
 int MIN = 10;
 for (int i = 0; i < wdth; i ++)
 {
 cout<<"Calculating lowest grade for "<<i+1<<" student: "<<endl;
 for (int j = 0; j < wdth; j ++)
 {
 temp = matrix[i][j];
 if (temp < MIN)
 {
 MIN = temp;
 }
 }
 cout<<MIN;
 }
 return 0;
}

ERRORS:

cpp(11) : error C2664: 'input' : cannot convert parameter 1 from 'int' to 'int [][4]'
 Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
cpp(12) : error C2664: 'average' : cannot convert parameter 1 from 'int' to 'int [][4]'
 Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast

Answer 1

input (matrix [4][4], wdth); Here matrix [4][4] is an element of the matrix i.e. an int. You need to do input(matrix,wdth);

Answer 2

input (matrix [4][4], wdth);
average (matrix [4][4], wdth);
min (matrix [4][4], wdth);

Try it this way. :)

input (matrix, wdth);
average (matrix, wdth);
min (matrix, wdth);

With matrix[4][4] your passing the 4th element of the 4th row. ;)