A greet message according to marks obtained by a student.

class Greet{

      public static void main(String args[]){

          int marks = Integer.parseInt(args[0]);                

         switch(marks/10){

            case 10:

            case 9:

            case 8:

                     System.out.println("Excellent");

                     break;

            case 7:

                     System.out.println("Very Good");

                     break;

            case 6:

                     System.out.println("Good");

                     break;

            case 5:

                     System.out.println("Work Hard");

                     break;

            case 4:

                     System.out.println("Poor");

                     break;

            case 3:

            case 2:

            case 1:

            case 0:

                     System.out.println("Very Poor");

                     break;

            default:

                     System.out.println("Invalid value Entered");

      }

 }

}

Find the average and grade of a student

Write a programe to input three marks of a student and determine the average. Print a suitable grade if the average is between;
75-100 – A

60-74 – B

50-59 – C

0-49 – D

Print an error message if a negative number is entered or if the number is not with in the range from 0 to 100.

class Results {
 public static void main(String[] args) {
  int x = 35;
  int y = 24;
  int z = 12;
  int average=0;
 if (x > 100 | y > 100 | z > 100 | x < 0 | y < 0 | z <0 ) {
  System.out.println("The entered number is not with in the range from 0 to 100. Please enter a valid number.");
 } else {
  average = (x + y + z) / 3;
  System.out.println("Average : " + average);
 } 
 if (average>75){
  System.out.println("Grade : A");
}else if(average>60){
  System.out.println("Grade : B");
}else if(average>50){
  System.out.println("Grade : c");
}else if(average>0){
  System.out.println("Grade : D");
}
}
}