visual basic barcode program Calculating Values from a Truth Table in Java

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Calculating Values from a Truth Table
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3: Operators and Assignments
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operand bits in the same position are 1, the | operator will set the resulting bit to 1 if either (of both) of the bits is a 1. So, for the numbers 10 and 9, we get the following,
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1010 | 1001 = 1011
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which is easier to see as
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1 0 1 0 | 1 0 0 1 ____________ 1 0 1 1
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In this case because we have 1s in the 1, 2, and 8 bit slots, those bits are carried in to the result. This expression produces the number 11 (in decimal). Let s look at this in code:
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class Bitwise { public static void main(String [] args) { int x = 10 | 9; // 1010 and 1001 System.out.println("1010 & 1001 = " + x); } }
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When we run the preceding code, we receive the following:
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%java Bitwise 1010 & 1001 = 11
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The ^ (Exclusive OR, also known as XOR) operator compares two bits to see if they are different. If they are different, the result is a 1. Look at the numbers 10 and 5 in bit representation:
1010 ^ 0101 = 1111
As we can see, the result is 15 in decimal form. To see it a little more clearly:
1 0 1 0 ^ 0 1 0 1 _____________ 1 1 1 1
Now let s look at doing an XOR on 8 and13:
1000 ^ 1101 = 0101
Java Operators (Exam Objective 5.1)
The result is 5 in decimal form.
1 0 0 0 ^ 1 1 0 1 ____________ 0 1 0 1
Bitwise Complement Operator
The ~ operator is a flip-the-bits operator. It will change all 1s to 0s and vice versa. Look at the following code:
class Bitwise { public static void main(String [] args) { int x = 5; System.out.println("x is initially " + x); x = ~x; System.out.println("~x is equal to " + x); } }
This program is changing every bit into its complement; thus, the output from this program is the following:
%java Bitwise x is initially 5 ~x is equal to -6
In bit representation, the conversion looks like this,
~0000 0000 0000 0000 0000 0000 0000 0101
and converts to
1111 1111 1111 1111 1111 1111 1111 1010
Conditional Operator
The conditional operator is a ternary operator (it has three operands) and is used to evaluate boolean expressions, much like an if statement except instead of executing a block of code if the test is true, a conditional operator will assign a value to a variable. In other words, the goal of the conditional operator is to decide which of
3: Operators and Assignments
two values to assign to a variable. A conditional operator is constructed using a (question mark) and a : (colon). The parentheses are optional. Its structure is as follows: someVariable = (boolean expression) value to assign if true : value to assign if false Let s take a look at a conditional operator in code:
class Salary { public static void main(String [] args) { int numOfPets = 3; String status = (numOfPets<4) "Pet limit not exceeded":"too many pets"; System.out.println("This pet status is " + status); } }
You can read the preceding code as: Set numOfPets equal to 3. Next we re going to assign a String to the status variable. If numOfPets is less than 4, assign Pet limit not exceeded to the status variable; otherwise, assign too many pets to the status variable. A conditional operator starts with a boolean operation, followed by two possible values for the variable to the left of the conditional operator. The first value (the one to the left of the colon) is assigned if the conditional (boolean) test is true, and the second value is assigned if the conditional test is false. You can even nest conditional operators into one statement.
class AssignmentOps { public static void main(String [] args) { int sizeOfYard = 10; int numOfPets = 3; String status = (numOfPets<4) "Pet count OK" :(sizeOfYard > 8) "Pet limit on the edge" :"too many pets"; System.out.println("Pet status is " + status); } }
Don t expect many questions using conditional operators, but you need to be able to spot them and respond correctly. Conditional operators are sometimes confused with assertion statements, so be certain you can tell the difference. 4 covers assertions in detail.
Java Operators (Exam Objective 5.1)
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