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Thread: Can you help me to make this calculator better

  1. #1
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    Post Can you help me to make this calculator better

    package com.company;

    import javax.swing.*;

    class Calculator {
    static void Addition() {
    Float sum = Float.parseFloat(JOptionPane.showInputDialog("Ente r First value:-"));
    Float sum2 = Float.parseFloat(JOptionPane.showInputDialog("Ente r second value"));
    Float answer = sum + sum2;
    System.out.println("\nThis is your answer:-");
    System.out.println("\n " + answer);
    }

    static void Subtraction() {
    Float sub = Float.parseFloat(JOptionPane.showInputDialog("Ente r First value:-"));
    Float sub2 = Float.parseFloat(JOptionPane.showInputDialog("Ente r second value:-"));
    Float answer = sub - sub2;
    System.out.println("\nThis is your Answer:-");
    System.out.println("\n " + answer);
    }

    static void Multiplication() {
    Float mul = Float.parseFloat(JOptionPane.showInputDialog("Ente r first value:-"));
    Float mul2 = Float.parseFloat(JOptionPane.showInputDialog("Ente r second value:-"));
    Float answer = mul * mul2;
    System.out.println("\nThis is your answer:-");
    System.out.println(" " + answer);
    }

    static void Division() {
    Float div = Float.parseFloat(JOptionPane.showInputDialog("Ente r first value:-"));
    Float div2 = Float.parseFloat(JOptionPane.showInputDialog("Ente r second value"));
    Float answer = div / div2;
    System.out.println("\nThis is your answer:-");
    System.out.println("\n " + answer);
    }

    static void exponents(){
    Float base = Float.parseFloat(JOptionPane.showInputDialog("Ente r base:-"));
    Float power = Float.parseFloat(JOptionPane.showInputDialog("Ente r power:-"));
    double answer = Math.pow(base,power);
    System.out.println("\nThis is your answer:-");
    System.out.println(" "+answer);
    }
    static void percentage(){
    Float number = Float.parseFloat(JOptionPane.showInputDialog("Ente r number:-"));
    Float percentage = Float.parseFloat(JOptionPane.showInputDialog("Ente r percentage you want to calculate:-"));
    Float total = 1/100F*percentage;
    Float total2 = total*number;
    System.out.println("\nThis is your answer:-");
    System.out.println(" "+total2);
    }
    static void sum_of_factors(){
    int n = Integer.parseInt(JOptionPane.showInputDialog("Plea se enter a number to find sum of divisors:-"));
    int i,sum = 0;
    for (i=1;i<=n;i++)
    {
    if (n%i==0) {
    sum = sum+i;

    }

    }
    System.out.println("Sum of divisors of "+n+" = "+sum);
    }
    static void product_of_divisors(){
    int n = Integer.parseInt(JOptionPane.showInputDialog("Ente r a number to find product of divisors"));
    int i,product = 1;
    for (i = 1;i<=n;i++){
    if (n%i==0){
    product = product*i;
    }
    }
    System.out.println("Product of divisors of "+n+" = "+product);
    }
    public static void main(String[]args){
    String arthimeticoperation;
    char selection;

    System.out.println("Possible arithmetic operations:-\n a addition \n b subtraction \n c Multiplication \n d Division \n e Exponents \n f percentage \n g sum of divisors of numbers \n h product of divisors");
    arthimeticoperation = JOptionPane.showInputDialog("What would you like to initiate?:-");
    selection = arthimeticoperation.charAt(0);
    switch (selection){
    case 'a':
    Addition();
    break;
    case 'b':
    Subtraction();
    break;
    case 'c':
    Multiplication();
    break;
    case 'd':
    Division();
    break;
    case 'e':
    exponents();
    break;
    case 'f':
    percentage();
    break;
    case 'g':
    sum_of_factors();
    break;
    case 'h':
    product_of_divisors();
    break;
    default:
    System.out.println("Please enter a valid variable");
    break;
    }

    }
    }

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Can you help me to make this calculator better

    First suggestion is to move the prompts for user input to a separate method that gets and validates the values from the user and returns them in a custom class.

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Junior Member
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    Default Can you help me make this ATM better?????

    package com.company;

    import javax.swing.*;

    class ATM{
    static void Balance(){
    String restart = "Y";
    Float balance = 77000.54F;
    System.out.println("This is you Balance:- "+balance);
    restart = String.join(JOptionPane.showInputDialog("Would you like to go back?));
    if (restart == "no") {
    System.out.println("Thank you");
    }
    }
    static void withdrawl(){
    Float balance = 77000.54F;
    Float withdrawl = Float.parseFloat(JOptionPane.showInputDialog("How much do you want to withdraw?:- "));
    if (withdrawl <= balance){
    balance = balance - withdrawl;
    System.out.println("\nNow,This is your Balance:- "+balance);
    }else{
    System.out.println("\nPlease enter desired amount");
    }
    }
    static void Pay_in(){
    Float balance = 77000.54F;
    Float Pay_in = Float.parseFloat(JOptionPane.showInputDialog("\nHo w much do you want to Pay in?));
    if (Pay_in == Pay_in){
    balance = balance + Pay_in;
    System.out.println("Now,This is your balance:- "+balance);
    }else {
    System.out.println("\nPlease enter a desired amount);
    }
    }
    static void return_card(){
    System.out.println("Please wait while your card is returned");
    System.out.println("Thank you for your service");
    }
    public static void main(String[]args){
    int chances = 4;
    while (chances >= 0){
    System.out.println("Welcome to Bank of America");
    Integer pin = Integer.parseInt(JOptionPane.showInputDialog("Plea se enter your 4 digit pin));
    if (pin == 1234){
    System.out.println("Congratulations you have entered your pin sucessfully");
    String options;
    char selection;
    System.out.println("\nPress 1 to see your Balance \nPress 2 to Withdrawl \nPress 3 to Pay in \nPress 4 to return card");
    options = JOptionPane.showInputDialog("\nWhat would you like to choose);
    selection = options.charAt(0);

    switch (selection){
    case '1':
    Balance();
    break;
    case '2':
    withdrawl();
    break;
    case '3':
    Pay_in();
    break;
    case '4':
    return_card();
    break;
    default:
    System.out.println("Please enter a valid option");
    }
    }else {
    System.out.println("Incorrect pin please try again");
    chances = chances - 1;
    if (chances == 3) {
    System.out.println("3 more tries");
    }else if (chances == 2){
    System.out.println("2 more tries");
    }else if (chances == 1){
    System.out.println("This is your last try");
    }
    }
    }
    }
    }

  4. #4
    Super Moderator Norm's Avatar
    Join Date
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    Default Re: Can you help me make this ATM better?????

    Use the equals method to compare the contents of String objects, not the == operator.

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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