/* Each row represent a student with 4 grades
each column represents the exams */
#include <stdio.h>
#define STUDENTS 3
#define EXAMS 4

int minimum( const int [][ EXAMS ], int, int );
int maximum( const int [][ EXAMS ], int, int );
double average( const int [], int );
void printArray( const int [][ EXAMS ], int, int );

int main()
{
int student;
const int studentGrades[ STUDENTS ][ EXAMS ] =
{ { 77, 68, 86, 73 },
{ 96, 87, 89, 78 },
{ 70, 90, 86, 81 } };

printf( "The array is:\n" );
printArray( studentGrades, STUDENTS, EXAMS );
printf( "\n\nLowest grade: %d\nHighest grade: %d\n",
minimum( studentGrades, STUDENTS, EXAMS ),
maximum( studentGrades, STUDENTS, EXAMS ) );

for ( student = 0; student <= STUDENTS - 1; student++ )
printf( "The average grade for student %d is %.2f\n",
student,
average( studentGrades[ student ], EXAMS ) );

return 0;
}

/* Find the minimum grade */
int minimum( const int grades[][ EXAMS ],
int pupils, int tests )
{
int i, j, lowGrade = 100;

for ( i = 0; i <= pupils - 1; i++ )
for ( j = 0; j <= tests - 1; j++ )
if ( grades[ i ][ j ] < lowGrade )
lowGrade = grades[ i ][ j ];

return lowGrade;
}

/* Find the maximum grade */
int maximum( const int grades[][ EXAMS ],
int pupils, int tests )
{
int i, j, highGrade = 0;

for ( i = 0; i <= pupils - 1; i++ )
for ( j = 0; j <= tests - 1; j++ )
if ( grades[ i ][ j ] > highGrade )
highGrade = grades[ i ][ j ];

return highGrade;
}

/* Determine the average grade for a particular exam */
double average( const int setOfGrades[], int tests )
{
int i, total = 0;

for ( i = 0; i <= tests - 1; i++ )
total += setOfGrades[ i ];

return ( double ) total / tests;
}

/* Print the array */
void printArray( const int grades[][ EXAMS ],
int pupils, int tests )
{
int i, j;

printf( " [0] [1] [2] [3]" );

for ( i = 0; i <= pupils - 1; i++ ) {
printf( "\nstudentGrades[%d] ", i );

for ( j = 0; j <= tests - 1; j++ )
printf( "%-5d", grades[ i ][ j ] );
}
}