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public class Gradebook {
    Scanner reader = new Scanner(System.in); 
    String name;
    float[] homework_grades = new float[10];
    float[] quiz_grades = new float[4];
    float[] test_grades = new float[2];
    float hgrades;
    float qgrades;
    float tgrades;
    float grade;
    float points_possible;
    float points_earned;
 
    public static main(String[] args) {
        System.out.println("What is your full name?");
        name = reader.next();
        homework();
        quizzes();
        tests();
        changer();
        weigher();
        grade = hgrades + qgrades + tgrades;
        grade *= 100
        if (grade > 90) {
            System.out.println(name + "'s grade is: A");
        } else if (grade > 80) {
            System.out.println(name + "'s grade is: B");
        } else if (grade > 70) {
            System.out.println(name + "'s grade is: C");
        } else if (grade > 60) {
            System.out.println(name + "'s grade is: D");
        } else {
            System.out.println(name + "'s grade is: E");
        }
        System.out.println(name + "'s percent is: " + grade);
        System.out.println("Points possible: " + points_possible);
        System.out.println("Points earned: " + points_earned);
    }
 
    public static void String homework() {      //Takes homework grades and stores them
        int a, int b;
        for (int i = 0; i == 10; ++i) {
            a = null;
            b = null;
            System.out.println("Enter a homework assigment grade."); 
            a = reader.next();
            points_earned += a;
            System.out.println("Enter a homework assigment points possible");
            b = reader.next();
            points_possible += b;
            homework_grades(i) = (a / b);
        }
    }
    public static void String quizzes() {      //Takes quizzes grades and stores them
        int c, int d;
        for (int i = 0; i == 4; ++i) {
            c = null;
            d = null;
            System.out.println("Enter a quiz grade."); 
            c = reader.next();
            points_earned += c;
            System.out.println("Enter the points possible.");
            d = reader.next();
            points_possible +=d;
            quiz_grades(i) = (c / d);
        }
    }
 
    public static void String tests() {      //Takes tests grades and stores them
        int e, int f;
        for (int i = 0; i == 2; ++i) {
            e = null;
            f = null;
            System.out.println("Enter a test grade."); 
            e = reader.next();
            points_earned += e;
            System.out.println("Enter the points possible");
            f = reader.next();
            points_possible += f;
            test_grades(i) = (e / f);
        }
    }
 
    public static void String changer() {   //Adds up grades into 1 variable
        for (int i = 0; i == 10; ++i) {
            hgrades += homework_grades(i);
        }
        hgrades = hgrades/10
 
        for (int i = 0; i == 4; ++i) {
            qgrades += quiz_grades(i);
        }
        qgrades = qgrades/4
 
        for (int i = 0; i == 2; ++i) {
            tgrades += test_grades(i);
        }
        tgrades = tgrades/10
    }
 
    public String weigher() {               //Weighs different grades
        hgrades *= 0.5;
        qgrades *= 0.3;
        tgrades *= 0.2;
    }
    .
 
}

Main.java:14: error: invalid method declaration; return type required
    public static main(String[] args) {
                  ^
Main.java:23: error: ';' expected
        grade *= 100
                    ^
Main.java:40: error: '(' expected
    public static void String homework() {      //Takes homework grades and stores them
                              ^
Main.java:41: error: <identifier> expected
        int a, int b;
              ^
Main.java:41: error: not a statement
        int a, int b;
                   ^
Main.java:54: error: '(' expected
    public static void String quizzes() {      //Takes quizzes grades and stores them
                              ^
Main.java:55: error: <identifier> expected
        int c, int d;
              ^
Main.java:55: error: not a statement
        int c, int d;
                   ^
Main.java:69: error: '(' expected
    public static void String tests() {      //Takes tests grades and stores them
                              ^
Main.java:70: error: <identifier> expected
        int e, int f;
              ^
Main.java:70: error: not a statement
        int e, int f;
                   ^
Main.java:84: error: '(' expected
    public static void String changer() {   //Adds up grades into 1 variable
                              ^
Main.java:88: error: ';' expected
        hgrades = hgrades/10
                            ^
Main.java:93: error: ';' expected
        qgrades = qgrades/4
                           ^
Main.java:98: error: ';' expected
        tgrades = tgrades/10
                            ^
Main.java:106: error: illegal start of type
    .
    ^
Main.java:106: error: ';' expected
    .
     ^
Main.java:108: error: reached end of file while parsing
}
 ^
18 errors

Standard output is empty