mark auto home work

main.dart

void main() {
  //if switch tenary
  int mark = -1;
  if (mark >= 80) {
    print("Excellent");
  } else if (mark >= 60) {
    print("Good");
  } else if (mark >= 40) {
    print("Pass");
  } else if (mark >= 0) {
    print("Failed");
  } else {
    print("invalid");
  }
}