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Simple calculator

 
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Simple calculator, a simeple basic java calculator
qaz1134
post 27 Jun, 2008 - 03:38 AM
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hello guys can anyone thst is soo good and soo nice that could help me with this!!!
actually the code is kinda correct but my problem is : how can i insert or add someting to make it complex

logically
the program is like this :::: 1+1 = 2

i need to make it like this :::: 1+2-1*1=2 or 1/1+1=2 somthimg like this

the program goes this way:::::

CODE

class Calculator{
    int answer;

    void addition (int a,int b) {
        answer a + b;
}
    int multiplication (int a,int b) {
        answer a * b;
}
    int subtraction (int a,int b) {
        answer a - b;
}
    int division (int a,int b) {
        answer a / b;
}

void Showanswer() {

    System.out.println("The answer is:" + answer);
}

    public static void main(String[] args) {

    Calculator calcu;
    calcu = new Calculator();
    calcu.addition(4,3);
    calcu.Showanswer();
    calcu.subtraction(4,3);
    calcu.Showanswer();
    calcu.multiplication(4,3);
    calcu.Showanswer();
    calcu.division(4,3);
    calcu.Showanswer();
    }
}



please help smile.gif
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nick2price
post 27 Jun, 2008 - 09:13 AM
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Have you checked this code out? Before you go onto somthing a bit more complex, you might want to take a look at what you have done.
CODE
void addition (int a,int b) {
        answer a + b;

Wont return anything the way you are printing out
CODE
System.out.println("The answer is:" + answer);


Also
CODE
    int multiplication (int a,int b) {
        answer a * b;
}
    int subtraction (int a,int b) {
        answer a - b;
}
    int division (int a,int b) {
        answer a / b;
}


with these methods you need to return somthing, and you are missing an = sign.
CODE
    int division (int a,int b) {
        return answer = a / b;
}
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qaz1134
post 29 Jun, 2008 - 07:36 AM
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QUOTE(nick2price @ 27 Jun, 2008 - 09:13 AM) *

Have you checked this code out? Before you go onto somthing a bit more complex, you might want to take a look at what you have done.
CODE
void addition (int a,int b) {
        answer a + b;

Wont return anything the way you are printing out
CODE
System.out.println("The answer is:" + answer);


Also
CODE
    int multiplication (int a,int b) {
        answer a * b;
}
    int subtraction (int a,int b) {
        answer a - b;
}
    int division (int a,int b) {
        answer a / b;
}


with these methods you need to return somthing, and you are missing an = sign.
CODE
    int division (int a,int b) {
        return answer = a / b;
}






yup iam very sorry for that.. i just have type in the code and iam kindda in a hurry o0n that time

CODE
class Calculator{
    int answer;

    void addition (int a,int b) {
        answer = a + b;
}
    void multiplication (int a,int b) {
        answer = a * b;
}
    void subtraction (int a,int b) {
        answer = a - b;
}
    void division (int a,int b) {
        answer = a / b;
}

void Showanswer() {

    System.out.println("The answer is:" + answer);
}

    public static void main(String[] args) {

    Calculator calcu;
    calcu = new Calculator();
    calcu.addition(4,3);
    calcu.Showanswer();
    calcu.subtraction(4,3);
    calcu.Showanswer();
    calcu.multiplication(4,3);
    calcu.Showanswer();
    calcu.division(4,3);
    calcu.Showanswer();
    }
}




so sorry i dont mean to return anything i just have put void to be more simpler

tnx biggrin.gif
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RoboAlex
post 29 Jun, 2008 - 08:51 AM
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Making the methods return int will actually make everything much easier. You won't need need the variable answer anymore, and you could print the answers out like this:
System.out.println(calcu.addition(3,4));
all in one line, nice and neat.
Not to mention that it's the proper way to do it because it lets you actually DO something with your result.

So what was it you were trying to do with making the logic complicated?

This post has been edited by RoboAlex: 29 Jun, 2008 - 08:52 AM
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qaz1134
post 1 Jul, 2008 - 10:41 AM
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so can anyone help me how to????
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gl3thr0
post 1 Jul, 2008 - 11:16 AM
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im sorry but before we provide u with any code u have to at least make an effort.. yes u have very simple functions that can be used to +,-,X,/ but you have made no effort to try and make the program even slightly complex.
first you would have to write a function to take user input like 1+2,3+4 and so on. after u get it working like that try and expand it 2 take in more complex expressions...
we are here to help u so post any errors u recieve while working on it.
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DillonSalsman
post 1 Jul, 2008 - 04:36 PM
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http://www.myflex.org/books/JavaKid8x11.pdf
This guide helped me amazingly in Java developement and just so happens to have lesson on not just making a calculator but a graphic (not graphiNG) calculator. With like buttons and what not.
: ) give it a peek
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qaz1134
post 1 Jul, 2008 - 11:51 PM
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so can you help me put another function???? to make it multi functional??? please

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gl3thr0
post 2 Jul, 2008 - 01:45 AM
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QUOTE(qaz1134 @ 1 Jul, 2008 - 11:51 PM) *

so can you help me put another function???? to make it multi functional??? please



yes but show us ur attempt at making it "multi functional" just show us what u've got
but basicly ur going to have to first take user input which can be done with "java.util.Scanner" or "java.io.Bufferedreader"and save it asa string
then u will need to be able to take the numbers and symbols out of the that string and perfrom operations on them with ur methods.. so id advise u to first get it working for expressions like 1+2 and 2-4. be4 making it more powerful.

take it in baby steps and if u cant get it show us what u have and we'll help fix it
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qaz1134
post 10 Jul, 2008 - 09:35 AM
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QUOTE(gl3thr0 @ 2 Jul, 2008 - 01:45 AM) *

QUOTE(qaz1134 @ 1 Jul, 2008 - 11:51 PM) *

so can you help me put another function???? to make it multi functional??? please



yes but show us ur attempt at making it "multi functional" just show us what u've got
but basicly ur going to have to first take user input which can be done with "java.util.Scanner" or "java.io.Bufferedreader"and save it asa string
then u will need to be able to take the numbers and symbols out of the that string and perfrom operations on them with ur methods.. so id advise u to first get it working for expressions like 1+2 and 2-4. be4 making it more powerful.

take it in baby steps and if u cant get it show us what u have and we'll help fix it






thankyou very much i really i jus need something like that...
its ok i dont you to type the correct code for me i just want some advice or suggestion ....
cause i dnt have any idea where iam going...


thanks 4 the help ...
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