Thread: help me please this is a calculator by the way

What did I do wrong here? I was trying to make a calculator for my AP Comp Science class and it turned out now to work.. I followed the teachers instructions but it didn't work. Does anyone have any suggestions on how to fix this?Thanks

import java.util.*;
 
public class d
{
    public static void main(String[] args)
    {
        /*Scanner input = new Scanner(System.in);
        System.out.println("What are you doing?");
        if (answer.equalsIgnorecase("multiplication"))
        {
            Multiplication();
        }*/
        System.out.println("Hello, If you are doing Multiplication Type 1.");
        System.out.println("If you are doing Addition, Type 2.");
        System.out.println("If you are doing Subtraction, Type 3");
        System.out.println("If you are doing Division, Type 4");
        Scanner input = new Scanner(System.in);
        int decision;
        decision = input.nextInt();
        if (decision == 1)
        {
            Multiplication();
        }
        if (decision == 2)
        {
            Addition();
        }
        if (decision == 3)
        {
            Subtraction();
        }
        if (decision == 4)
        {
            Division();
        }
        else {
            System.out.println("Those aren't valid numbers.");
        }
    }
 
 
    }
    public static void Multiplication()
    {
        int mInput1;
        int mInput2;
 
        Scanner input = new Scanner(System.in);
        System.out.print("What is the first number? ");
        mInput1 = input.nextInt();
 
        System.out.print("What is the second number? ");
        mInput2 = input.nextInt();
 
        System.out.println(mInput1 + " times " + mInput2 + " equals " + mInput1 * mInput2);
    }
    public static void Addition()
    {
        int aInput1;
        int aInput2;
        int aAnswer;
 
        Scanner input = new Scanner(System.in);
        System.out.println("What is the first number?");
        aInput1 = input.nextInt();
 
        System.out.println("What is the second number?");
        aInput2 = input.nextInt();
 
        aAnswer = aInput1 + aInput2;
        System.out.println(aInput1 + " plus " + aInput2 + " equals " + aAnswer);
    }
    public static void Subtraction()
    {
        int sInput1;
        int sInput2;
        int sAnswer;
 
        Scanner input = new Scanner(System.in);
        System.out.println("What is the first number?");
        sInput1 = input.nextInt();
 
        System.out.println("What is the second number?");
        sInput2 = input.nextInt();
 
        sAnswer = sInput1 - sInput2;
        System.out.println(sInput1 + " minus " + sInput2 + " equals " + sAnswer);
    }
    public static void Division()
    {
        int dInput1;
        int dInput2;
        int dAnswer;
 
        Scanner input = new Scanner(System.in);
        System.out.println("What is the first number?");
        dInput1 = input.nextInt();
 
        System.out.println("What is the second number?");
        dInput2 = input.nextInt();
 
        dAnswer = dInput2 / dInput1;
        System.out.println(dInput1 + " divided by " + dInput2 + " equals " + dAnswer);
    }
}

What did I do wrong here

Please explain.

The first problem I see is the classname. d????

Please edit your post and wrap your code with code tags:
[code=java]
YOUR CODE HERE
[/code]
to get highlighting and preserve formatting.

it didn't work

Please explain.

The first problem I see is the classname. d????

1 out of 3 is a start.