Thread: can anyone help?

So, this is a GPA Calculator. I want it to allow the user to enter the number of classes they have and use that number to determine how many times to ask them what the grade is.

import java.io.*;
 
import static java.lang.System.*;
 
import java.util.Scanner;
 
 
 
 
 
 
 
class GPACalculator{
 
 
 
 
 
  public static void main (String str[]) throws IOException{
 
 
 
    Scanner scan = new Scanner (System.in);
 
 
 
      double a;
 
      double b;
 
      double c;
 
      double d;
 
      double e;
 
      double f;
 
      double g;
 
      double h;
 
      double r;
 
 
 
    System.out.println("Please enter the number of classes you have.");
 
    r = scan.nextDouble();
 
    if (r == 1);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Your GPA is " + a + ".");}
 
      if(false)
 
        return;
 
 
 
    if (r == 2);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Please enter 'Class 2'");
 
      b = scan.nextDouble();
 
      double x = (double) (a + b)/2;
 
      System.out.println("Your GPA is " + x + ".");}
 
      if(false)
 
        return;
 
 
 
    if (r == 3);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Please enter 'Class 2'");
 
      b = scan.nextDouble();
 
      System.out.println("Please enter 'Class 3'");
 
      c = scan.nextDouble();
 
      double y = (double) (a + b + c)/3;
 
      System.out.println("Your GPA is " + y + ".");}
 
      if(false)
 
        return;
 
 
 
    if (r == 4);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Please enter 'Class 2'");
 
      b = scan.nextDouble();
 
      System.out.println("Please enter 'Class 3'");
 
      c = scan.nextDouble();
 
      System.out.println("Please enter 'Class 4'");
 
      d = scan.nextDouble();
 
      double z = (double) (a + b + c + d)/4;
 
      System.out.println("Your GPA is " + z + ".");}
 
      if(false)
 
        return;
 
 
 
    if (r == 5);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Please enter 'Class 2'");
 
      b = scan.nextDouble();
 
      System.out.println("Please enter 'Class 3'");
 
      c = scan.nextDouble();
 
      System.out.println("Please enter 'Class 4'");
 
      d = scan.nextDouble();
 
      System.out.println("Please enter 'Class 5'");
 
      e = scan.nextDouble();
 
      double w = (double) (a + b + c + d + e)/5;
 
      System.out.println("Your GPA is " + w + ".");}
 
      if(false)
 
        return;
 
 
 
    if (r == 6);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Please enter 'Class 2'");
 
      b = scan.nextDouble();
 
      System.out.println("Please enter 'Class 3'");
 
      c = scan.nextDouble();
 
      System.out.println("Please enter 'Class 4'");
 
      d = scan.nextDouble();
 
      System.out.println("Please enter 'Class 5'");
 
      e = scan.nextDouble();
 
      System.out.println("Please enter 'Class 6'");
 
      f = scan.nextDouble();
 
      double v = (double) (a + b + c + d + e + f)/6;
 
      System.out.println("Your GPA is " + v + ".");}
 
      if(false)
 
        return;
 
 
 
    if (r == 7);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Please enter 'Class 2'");
 
      b = scan.nextDouble();
 
      System.out.println("Please enter 'Class 3'");
 
      c = scan.nextDouble();
 
      System.out.println("Please enter 'Class 4'");
 
      d = scan.nextDouble();
 
      System.out.println("Please enter 'Class 5'");
 
      e = scan.nextDouble();
 
      System.out.println("Please enter 'Class 6'");
 
      f = scan.nextDouble();
 
      System.out.println("Please enter 'Class 7'");
 
      g = scan.nextDouble();
 
      double u = (double) (a + b + c + d + e + f + g)/7;
 
      System.out.println("Your GPA is " + u + ".");}
 
      if(false)
 
        return;
 
 
 
    if (r == 8);{
 
      System.out.println("Please enter the number corresponding with your class grades.");
 
      System.out.println("A = 4, B = 3, C = 2, D = 1 and F = 0");
 
      System.out.println("Please enter 'Class 1'");
 
      a = scan.nextDouble();
 
      System.out.println("Please enter 'Class 2'");
 
      b = scan.nextDouble();
 
      System.out.println("Please enter 'Class 3'");
 
      c = scan.nextDouble();
 
      System.out.println("Please enter 'Class 4'");
 
      d = scan.nextDouble();
 
      System.out.println("Please enter 'Class 5'");
 
      e = scan.nextDouble();
 
      System.out.println("Please enter 'Class 6'");
 
      f = scan.nextDouble();
 
      System.out.println("Please enter 'Class 7'");
 
      g = scan.nextDouble();
 
      System.out.println("Please enter 'Class 8'");
 
      h = scan.nextDouble();
 
      double t = (double) (a + b + c + d + e + f + g + h)/8;
 
      System.out.println("Your current GPA is " + t + ".");}
 
      if(false)
 
        return;
 
 
 
 
 
  }
 
}

And your question is?

I'm not sure how to do that.

Why do you have variables names 'a' through 'r'? Give your variables meaningful names.

Do you know for() loops? Do you know arrays?

Originally Posted by GregBrannon

Why do you have variables names 'a' through 'r'? Give your variables meaningful names.

Do you know for() loops? Do you know arrays?

No, I'm new to Java coding.