Main.c: In function 'main':
Main.c:7:9: error: 'garde' undeclared (first use in this function); did you mean 'grade'?
    7 |         garde=A;
      |         ^~~~~
      |         grade
Main.c:7:9: note: each undeclared identifier is reported only once for each function it appears in
Main.c:7:15: error: 'A' undeclared (first use in this function)
    7 |         garde=A;
      |               ^
Main.c:9:15: error: 'B' undeclared (first use in this function)
    9 |         grade=B;
      |               ^
Main.c:11:15: error: 'C' undeclared (first use in this function)
   11 |         grade=C;
      |               ^
Main.c:13:15: error: 'D' undeclared (first use in this function)
   13 |         grade=D;
      |               ^
Main.c:15:15: error: 'E' undeclared (first use in this function)
   15 |         grade=E;
      |               ^