Question

Given the following sequence of Java code: int var1 = 0b0001; int var2 = 0b1111; int results1 = var1 & var2; int results2 = var1 | var2; int results3 = var1 ^ var2; int printit = results1 + results2 + results3; What are the values for results1, results2, results3 and printit after executing the code?

Answer 1

Answer:

results1 = 1

results2 = 15

results3 = 14

printit = 30

Explanation:

public class HelloWorld{

    public static void main(String []args){

       int var1 = 0b0001;

       int var2 = 0b1111;

       int results1 = var1 & var2;

       int results2 = var1 | var2;

       int results3 = var1 ^ var2;

       int printit = results1 + results2 + results3;

       System.out.printf("%d %d %d %d", results1, results2, results3, printit);

    }

}

Output:

$javac HelloWorld.java

$java -Xmx128M -Xms16M HelloWorld

1 15 14 30

In this program we are performing binary operations with logical gates and binary numbers, to understand the result see each binary operation:

• var1 & var2: refers to the AND gate, since 0001 & 1111 is 0001 our result as an integer is 1
• var1 | var2: refers to the OR gate, since 0001 | 1111 is 1111 our result as an integer is 15
• var1 ^ var2: refers to the XOR gate, since 0001 ^ 1111 is 1110 our result as an integer is 14
• results1 + results2 + results3: refers to the sum of 3 integers, 1+15+14 equal 30