assigning int types to a boolean expression

[Michael Mikhail]

Hi. I`m new to java and i`m tring to understand something. i have the following program

public class LogicaOpTable {

    public static void main(String[] args) {
       boolean p, q;
       

       p = true; q = true;
       System.out.print(p + "\t" + q + "\t");
       System.out.print((p&q) + "\t" + (p|q) + "\t");
       System.out.println((p^q) + "\t" + (!p));
       
       p = true; q = false;
       System.out.print(p + "\t" +q + "\t");
       System.out.print((p&q) + "\t" + (p|q) + "\t");
       System.out.println((p^q) + "\t" + (!p));
       
       p = false; q= true;
       System.out.print(p + "\t" + q + "\t");
       System.out.print((p&q) + "\t" + (p|q) + "\t");
       System.out.println((p^q) + "\t" + (!p));  
       
       p = false; q = false;
       System.out.print(p + "\t" +q + "\t");
       System.out.print((p&q) + "\t" + (p|q) + "\t");
       System.out.println((p^q) + "\t" + (!p));
      
    }
}

and i need to make the program show 1 and 0 instead of true and false. How can i do that? from what i read i can`t assign an integer value to a boolean expression. i just can`t figure it out. Thanks!

[Riaan Nel]

Use an if statement. If the value that you're checking is true, print out "1" else print out "0".

[Michael Mikhail]

I was thinking on that but i was wondering if i have to create an if statement for each case or to create a general if statement to solve all 4 situations.

[Riaan Nel]

You'll want to check each result (e.g. whether p&q is true) individually, so you'll need multiple if statements. If you want to do the value-checking and printing in a single line for each case, you can also have a look at the ternary operator.

http://download.oracle.com/javase/tutorial/java/nutsandbolts/opsummary.html

[Campbell Ritchie]

Welcome to the Ranch

You should use the shortcut operators && and || rather than & and | for booleans, unless you specifically need to evaluate the right operand as well as the left.
Have you come across the ?: operator? And the % tags? The ?: operator will allow you to get 1 and 0 out of true and false, and the % tags are a nice way to print them

System.out.printf("p && q: %d\tp || q: %d%n", p && q ? 1 : 0, p || q ? 1 : 0);

Note you should use %n rather than \n in this context, but \t is all right. You can use a similar technique to get the output

1 && 0: 0     1 || 0: 1

... and you can reuse an argument with a number and a $ sign after the %.

[Riaan Nel]

Campbell Ritchie wrote:Welcome to the Ranch

You should use the shortcut operators && and || rather than & and | for booleans, unless you specifically need to evaluate the right operand as well as the left.
Have you come across the ?: operator? And the % tags? The ?: operator will allow you to get 1 and 0 out of true and false, and the % tags are a nice way to print them

System.out.printf("p && q: %d\tp || q: %d%n", p && q ? 1 : 0, p || q ? 1 : 0);

Note you should use %n rather than \n in this context, but \t is all right. You can use a similar technique to get the output

1 && 0: 0     1 || 0: 1

... and you can reuse an argument with a number and a $ sign after the %.

I completely forgot about printf()!

@OP; follow Campbell's suggestion. It's much cleaner than having a bunch of if statements.

[Rumesh Eranga]

Using ternary operator is way easy than having so many if conditions

Regards.