Modify Program 6.4 to read marks from the user. The first number of the input indicates the number of students in class (i.e., number of rows), and the next number represents the number of tests given...

Modify Program 6.4 to read marks from the user. The first number of the input indicates

the number of students in class (i.e., number of rows), and the next number represents

the number of tests given to the class (i.e., number of columns). Your program should

be able to handle up to 20 students and 5 tests. Report error when exceeding these

limits.