how to make calculator console

[verbal sphinx]

^

[gaunt lotus]

<@&987246399047479336> please have a look, thanks.

[gaunt lotus]

While you are waiting for getting help, here are some tips to improve your experience:

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[quaint locust]

do u know any java or is hello world all you've done?

[verbal sphinx]

i know python

and c#

its all

[quaint locust]

ok C# is similar

python is

[verbal sphinx]

yes

[quaint locust]

so like you just want to type in 3+7 and have it output 10?

[verbal sphinx]

yes

[quaint locust]

so if u only have + - * / then its not as bad; unless u want to have 'nested' operations; then that typically requires a parse tree

[verbal sphinx]

ok

i just want like that

enter operation: +
enter first number: 5
enter second number: 4
results: 9

[gaunt lotus]

Detected code, here are some useful tools:

[verbal sphinx]

LOL

its code??

frrr

what is that language

i want to use it

[quaint locust]

its cause u put it in a block quote

[verbal sphinx]

ohhh

[quaint locust]

hmm

[verbal sphinx]

detected code

sausag

[quaint locust]

it didnt that time; maybe if it has + : or numbers; i dont recall the bot's code off the top of my head

[verbal sphinx]

sosig
bla bla

var test = "hello"

bruh

here code

and it dont detect

stupid bot

[quaint locust]

i dont know lol

[verbal sphinx]

ok so

how to make calculator

[quaint locust]

You'll need to use a Scanner sc = new Scanner(System.in); to read console input

[verbal sphinx]

omg java stole "new" from c#!!!!!!

[quaint locust]

And then sc.nextLine(); to get a String of the next sent line from the console

new is a language construct in most things, especially C languages

[verbal sphinx]

c languages

what

[quaint locust]

derivations of the programming language C

C, C++, C#, Java are examples

the C family

[verbal sphinx]

like that

like that

[quaint locust]

the scanner isnt the operator

[verbal sphinx]

frrrrrrr

[quaint locust]

you'd have java Scanner sc = new Scanner(System.in); String operator = sc.nextLine();

[verbal sphinx]

isnt it storing thing

that it got

what i done not right

[verbal sphinx]

oh that

[quaint locust]

idk what first number and second number are; and + concatenates strings

you'd have to write the if else or switch logic based on the operator

[verbal sphinx]

import java.util.Scanner;

class main{
public static void main(String args[]){
Scanner sc1 = new Scanner(System.in);
System.out.println("choose operator");
String operator = sc1.nextLine();
Scanner sc2 = new Scanner(System.in);
System.out.println("choose first number");
String firstnumber = sc2.nextLine();
Scanner sc3 = new Scanner(System.in);
System.out.println("choose first number");
String secondnumber = sc3.nextLine();
System.out.println(operator+firstnumber+secondnumber);
}
}

how to have int

thing

[quaint locust]

so if u had numbers a and b then a start would be

double result = switch(operator) {
  case "+" -> a + b;
  // TODO  
  default -> throw new RuntimeException("Invalid operator " + operator);
}```

but you'll have to parse the input, unless u want to ask them in that specific order; which i suppose you should get working first

I could explain every step of every bit of java there is to accomplish these tasks, but you should probably read introduction to java articles/websites online to learn the basics of java; particularly console IO operations in this 'project'

[verbal sphinx]

how to get int

java hard 😭

c# easier

[quaint locust]

Integer.parseInt(stringvariable)

but you probably want to use doubles

floating points

so Double.parseDouble

note that there is no Double.tryParse(string, out x) in java, or other "try" methods. you'd have to make your own

[quaint locust]

i just realized u made a new scanner each time. you can re-use the same one

[verbal sphinx]

AAAAAAAAAAAAAAAAAAAAAAAAAAA

freacking java!!!!!

can i dont use cases

can i use if statement

🥺

[quaint locust]

yes but thats a bit longer to write for 4 discrete cases

and for java string comparisons you need to use .equals()

[verbal sphinx]

wth

import java.beans.PropertyEditorSupport;
import java.util.Scanner;

class main{
public static void main(String args[]){
Scanner sc1 = new Scanner(System.in);
System.out.println("choose operator");
String operator = sc1.nextLine();
Scanner sc2 = new Scanner(System.in);
System.out.println("choose first number");
String firstnumberstr = sc2.nextLine();
Double firstnumber = Double.parseDouble(firstnumberstr);
Scanner sc3 = new Scanner(System.in);
System.out.println("choose first number");
String secondnumberstr = sc3.nextLine();
Double secondnumber = Double.parseDouble(secondnumberstr);
if(operator=="+"){
Double result = firstnumber+secondnumber;
System.out.println(result);
}
}
}

here my code

also why it imports something

useless

like this beans

[quaint locust]

i said u gotta use .equals on strings

strings are objects

[verbal sphinx]

Double result = firstnumber+secondnumber.equals();

this

[quaint locust]

no operator.equals("+")

[verbal sphinx]

operator.equals("+");
Double result = firstnumber + secondnumber;
System.out.println(result);

like that

[quaint locust]

no the .equals expression goes in the if condition

[verbal sphinx]

OMG

THXXXXXX

MY FIRST CALCULATORRRRRRRRRRRRRRR

OMG

OMG

GOMGGG

g

g

g

[grave hedge]

@verbal sphinxcan you show the code when you finish just curious 😄

[uncut lark]

👌

[verbal sphinx]

hi admin

[verbal sphinx]

import java.util.Scanner;

class main{
public static void main(String args[]){
Scanner sc1 = new Scanner(System.in);
System.out.println("choose operator");
String operator = sc1.nextLine();
Scanner sc2 = new Scanner(System.in);
System.out.println("choose first number");
String firstnumberstr = sc2.nextLine();
Double firstnumber = Double.parseDouble(firstnumberstr);
Scanner sc3 = new Scanner(System.in);
System.out.println("choose first number");
String secondnumberstr = sc3.nextLine();
Double secondnumber = Double.parseDouble(secondnumberstr);
if(operator.equals("+")){
Double result = firstnumber + secondnumber;
System.out.println(result);
}
}
}

[gaunt lotus]

Detected code, here are some useful tools:

Formatted code

import java.util.Scanner;

class main {
  public static void main(String args[] ) {
    Scanner sc1 = new Scanner(System.in);
    System.out.println("choose operator");
    String operator = sc1.nextLine();
    Scanner sc2 = new Scanner(System.in);
    System.out.println("choose first number");
    String firstnumberstr = sc2.nextLine();
    Double firstnumber = Double.parseDouble(firstnumberstr);
    Scanner sc3 = new Scanner(System.in);
    System.out.println("choose first number");
    String secondnumberstr = sc3.nextLine();
    Double secondnumber = Double.parseDouble(secondnumberstr);
    if (operator.equals("+")) {
      Double result = firstnumber + secondnumber;
      System.out.println(result);
    }
  }
}

Please use this format for posting code:

```java
// Example java program
int value = 5;
System.out.println(value);
```

Which results in:

// Example java program
int value = 5;
System.out.println(value);

For syntax highlighting, you have to add the name of the language after the three backticks, like ```java. Please make sure to use exactly this format, so no space between the backticks and the language name, and a newline before the code starts. If done right, the syntax highlighting will even be applied to your text as you type, before sending.

MattDog_222 • used /tag id: code · Dec 25, 2022, 10:51 PM

[verbal sphinx]

ok bye

gys

[grave hedge]

@quaint locust can you make the user repeat the input if its not + - / or *?

[quaint locust]

you could have that instead of crashing

[verbal sphinx]

matt

helppppppp

ok no help need

switch(operator){
case "+":
System.out.println(firstnumber+secondnumber);
case "-":
System.out.println(firstnumber-secondnumber);
}

it doing every action

even if i choose +

it doing -

[rose trail]

no breaks were used :p

case <condition> :
do something;
break;

@verbal sphinx

[verbal sphinx]

ok me try

OMG THXXXXXXXXXX

[rose trail]

now go learn the basics of java before u continue :p

[verbal sphinx]

ok

[magic shore]

you should use the newer switch expressions btw

[verbal sphinx]

idc

[magic shore]

switch(operator) {
  case "+" -> System.out.println(firstnumber+secondnumber);
  case "-" -> System.out.println(firstnumber-secondnumber);
  default -> throw new RuntimeException();
};

or better

int result = switch(operator) {
  case "+" -> firstnumber+secondnumber;
  case "-" -> firstnumber-secondnumber;
  default -> throw new RuntimeException();
};
System.out.println(result);

[verbal sphinx]

ok