Using the definition
implement the procedure
that computes the minimum mark (min), the maximum mark (max) and the average mark (avg) of all the students of the table stu that have taken the exam and that are not repeaters. If none of the students that has these requirements, the value of these parameters must be −1.
Observation You only need to submit the required classes; your main program will be ignored. Strictly obey the type definitions of the statement.