Boolean help

[DMarsh12]

For my programming 1 class we are learning java and he told us to display this boolean expression

p+q((!p||q)&&(!q||p))

this is what i have so far but it keeps giving me an error saying it can't find q...what am i doing wrong? any help is greatly appreciated

public class booleans
{


public static void main(String[] args)
{

boolean p;
boolean q;
p=false;
q=false;
for(int i=0; i<=1; i++){
for(int j=0; j<=1; j++)
System.out.println(p+q((!p||q)&&(!q||p)));
}

}

}

[Dark]

I'm curious, why are you not initializing your variable in the declaration and why are you putting a loop inside of a loop to display the same output each time?

Your code would look much better like this:

public class booleans
{
public static void main(String[] args)
    {
        boolean p = false;
        boolean q = false;

        System.out.println(p+q((!p||q)&&(!q||p)));
    }
}

EDIT: I put the code into my editor to see what errors were popping up and its saying "q(boolean) is undefined for the type booleans." So the problem is its trying to put everything after the first q into a method. Since q doesn't have any methods you're going to have to review your boolean expression. My question is what does q( mean in a true or false? Its been a while since I took geometry so I'm lost as to what the expression is trying to represent.

When you just use ((!p||q)&&(!q||p)) it works just fine. However you can't use the +, -, * or / in a boolean expression. That's why you're getting your error.

EDIT2: Ok, so after consulting google about boolean functions you're trying to use operations that aren't supported in that function by Java. You have to change the q( with a && for multiplication and the p + q with a || according to google.

Addition is represented as OR in boolean algebra and multiplication is represented as AND.

Thus if your formula is System.out.println(p||q&&(!p||q)&&(!q||p)); it will work.

[baf06]

what do you exactly mean by :

(p+q((!p||q)&&(!q||p)))

It is the first time for me to perform mathematical operations with booleans, q is declared but not q(//something) i think your problem

[JosAH]

For my programming 1 class we are learning java and he told us to display this boolean expression

p+q((!p||q)&&(!q||p))

this is what i have so far but it keeps giving me an error saying it can't find q...what am i doing wrong? any help is greatly appreciated

public class booleans
{


public static void main(String[] args)
{

boolean p;
boolean q;
p=false;
q=false;
for(int i=0; i<=1; i++){
for(int j=0; j<=1; j++)
System.out.println(p+q((!p||q)&&(!q||p)));
}

}

}

You do have a local variable q but no method with the same name, i.e. q( ... ). The Java compiler considers that notation a method call. Most likely the expression should read: p+q&&((!p||q)&&(!q||p)). Java doesn't know implicit multiplications or conjunctions.

kind regards,

Jos

[baf06]

JosAh this will cause another error,

operator + cannot be applied to boolean,boolean

maybe he means to write : p && q && (!p||q) && (!q||p) this will work

[DMarsh12]

what do you exactly mean by :


It is the first time for me to perform mathematical operations with booleans, q is declared but not q(//something) i think your problem

all the symbols within it are supposed to be boolean...
for example the & means and the ! means not the | means or, etc...

and as for your post dark that is how the professor had it listed but for some reason he likes to put errors within the code for me to try and find even though i have no background whatsoever in java...

the output is supposed to be
false false true
false true false
true false false
true true true

i don't understand it at all and i tried darks suggestion and i got the same error... :eek:

[DMarsh12]

You do have a local variable q but no method with the same name, i.e. q( ... ). The Java compiler considers that notation a method call. Most likely the expression should read: p+q&&((!p||q)&&(!q||p)). Java doesn't know implicit multiplications or conjunctions.

kind regards,

Jos

JosAh this will cause another error,


maybe he means to write : p && q && (!p||q) && (!q||p) this will work

yes i did both of your suggestions and it worked...thank you very much +rep to the both of you

[Dark]

Look at my EDIT2, I don't believe its supposed to be p&&q&& in the front. According to what I found from google Multiplication is && and Addition is ||.


EDIT To avoid double posting: I put in the for loops you had into my code and the just looped the display on the output. It just displayed False 4 times. I'm not sure how you're supposed to get:
false false true
false true false
true false false
true true true



Out of your current code. You would have to change a variable to true or false every time it was looped.

[DMarsh12]

Look at my EDIT2, I don't believe its supposed to be p&&q&& in the front. According to what I found from google Multiplication is && and Addition is ||.


EDIT To avoid double posting: I put in the for loops you had into my code and the just looped the display on the output. It just displayed False 4 times. I'm not sure how you're supposed to get:
false false true
false true false
true false false
true true true



Out of your current code. You would have to change a variable to true or false every time it was looped.

yeah i have been getting the same output as well...i'm going to ask the professor tomorrow for some help with it and post back the correct form. thank you for the help tho.. +rep