/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | total = 0
      | ^~~~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'total' [-Wimplicit-int]
/in/foo.c:2:1: error: expected ',' or ';' before 'student_num'
    2 | student_num = 1
      | ^~~~~~~~~~~