// Number testing

import java.util.*;    

public class studentgrade



{

	public static void main (String[] args)

	{

	System.out.println("Please enter the students mark");

	int studentGrade;

	Scanner kybd = new Scanner(System.in);

	studentGrade = kybd.nextInt();

	

		       	{

			if 	((studentGrade >= 70) && (studentGrade =< 100));
				grade = "A"
			else if ((studentGrade >= 60) && (studentGrade =< 70));
				grade = "B"
			else if ((studentGrade >= 50) && (studentGrade =< 60));
				grade = "C"
			else if ((studentGrade >= 40) && (studentGrade =< 50));
				grade = "D"
			else if (studentGrade > 40);
				grade = "U"
			}
	System.out.println("The grade is "+grade);

		                            







	}

}


error

studentgrade.java:14: illegal start of type
                        if      ((studentGrade >= 70) && (studentGrade =< 100));
                                                                          ^
studentgrade.java:14: > expected
                        if      ((studentGrade >= 70) && (studentGrade =< 100));
                                                                               ^
studentgrade.java:16: ';' expected
                        else if ((studentGrade >= 60) && (studentGrade =< 70));
                        ^
studentgrade.java:18: ';' expected
                        else if ((studentGrade >= 50) && (studentGrade =< 60));
                        ^
studentgrade.java:20: ';' expected
                        else if ((studentGrade >= 40) && (studentGrade =< 50));
                        ^
studentgrade.java:22: ';' expected
                        else if (studentGrade > 40);
                        ^
studentgrade.java:24: ';' expected
                        }
                        ^
7 errors

error 2

studentgrade.java:14: illegal start of expression
                        if      ((studentGrade =>  70) && (studentGrade <= 100));
                                                ^
studentgrade.java:14: ')' expected
                        if      ((studentGrade =>  70) && (studentGrade <= 100));
                                                                                ^
studentgrade.java:16: ';' expected
                        else if ((studentGrade =>  60) && (studentGrade <= 70));
                        ^
studentgrade.java:18: ';' expected
                        else if ((studentGrade =>  50) && (studentGrade <= 60));
                        ^
studentgrade.java:20: ';' expected
                        else if ((studentGrade =>  40) && (studentGrade <= 50));
                        ^
studentgrade.java:22: ';' expected
                        else if (studentGrade > 40);
                        ^
studentgrade.java:24: ';' expected
                        }
                        ^
7 errors