我的java程序不会计算，请问我该怎么修改？

import java.util.Scanner;
import java.util.Random;
import java.text.DecimalFormat;

public class TutorialMark
{
public static void main (String[] args)
{
// Declare constants
final double IN_TUTE_PERCENT = 0.75; // in-Tutorial test percentage of final mark is 75%
final double OUT_TUTE_PERCENT = 0.25; // out-of-Tutorial test percentage of final mark is 25%
final int ONE_HUNDRED = 100; // constant used for percentages

// Declare variables
int beforeTuteMark; //number of marks gained for the before-Tutorial test
int beforeTuteMax; //maximum available marks for the before-Tutorial test
double tuteMarks; //number of marks gained for the at last
int tuteMax; //maximum available marks for the in-Tutorial test
int afterTuteMarks; //number of marks gained for the after-Tutorial test
int afterTuteMax; //maximum available marks for the after-Tutorial test
d

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