visual basic 2008 barcode generator Operators in Java

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Operators
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Two general types of operators are available in Java: binary operators and unary operators A binary operator requires two operands, such as the addition operator used
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in previous examples in this chapter A unary operator requires one operand For example, the incremental operator (++), which you ll learn about later in this chapter, is a unary operator because it increments the value of an operand That is, it adds one to the value of the operand Operators are also organized into the following four groups:
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Arithmetic operators Relational operators Logical operators Bitwise operators
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Arithmetic Operators
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Arithmetic operators perform arithmetic operations Table 3-2 contains a list of arithmetic operators You are already familiar with many of these operators because they are the same operators you use everyday to perform arithmetic However, you ll notice a few that are unusual, so we ll take a close look at those in this section
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Operation Addition Subtraction and unary minus Multiplication Division Modulus Addition assignment Subtraction assignment Multiplication assignment Division assignment Modulus assignment Increment Decrement
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Operator + * / % += -= *= /= %= ++ --
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Table 3-2
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Arithmetic Operators
CHAPTER 3 Expressions and Statements
Modulus Operator
The modulus operator is probably the first operator that catches your eye as being strange It looks as if it should return the percentage of an operand because the symbol for the modulus operator is a percentage symbol However, the modulus operator has nothing to do with percentage Instead, the modulus operator returns the remainder of the division of two operands This sounds confusing, so let s go directly to an example and see how the modulus operator works Run the following example and you ll see modulus: 4 displayed on the screen (4 is the remainder of 14 / 5)
class Demo { public static void main (String args[]) { Systemoutprintln ("modulus: " + 14%5); } }
Assignment Operator
The assignment operator (=) is probably one of the most misleading of all the operators because the symbol for the assignment operator is commonly used to express equality That is, two values are the same However, the assignment operator in Java tells Java to copy the value of the right operand and place it in the left operand This is illustrated in the next example, where the assignment operator in the first statement within the main() method tells Java to copy the value 5 (right operand) to the variable a (left operand):
class Demo { public static void main (String args[]) { int a = 5; Systemoutprintln ("assignment operator: " + a); } }
There is a tendency to say a equals 5, but that s not what is happening here Instead, we should say a is assigned the value 5 Later in this chapter, you ll learn about the relational equivalent operator (==), which is used to determine whether two operands are equal
Combined Assignment Operator
You ll notice several strange-looking arithmetical operators in Table 3-2 that seem to use two operator symbols, such as += These operators combine two operations
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into one operation Notice that the first operator symbol is an arithmetical operator The second operator symbol is the assignment operator Here s how this works: First, Java performs the operation specified by the first operator using the operand on the left and right of the operator The result is then assigned to the left operand The next example illustrates how each of these combined operators works The first statement assigns the value 5 to variable a, which is then displayed on the screen Next, the += operator is used First, Java adds 5 to the value stored in variable a Remember that the variable a represents the value 5 The sum of these values is 10 Next, Java assigns the sum to the left operand, which is variable a The new value of variable a is 10 See if you can determine what happens when the other statements are executed in this example and then run the example to check your answers:
class Demo { public static void main (String args[]) { int a = 5; Systemoutprintln ("a = 5: " + a); a += 5; Systemoutprintln ("a += 5: " + a); a -= 5; Systemoutprintln ("a -= 5: " + a); a *= 2; Systemoutprintln ("a *= 2: " + a); a /= 5; Systemoutprintln ("a /= 5: " + a); a %=5; Systemoutprintln ("a %= 5: " + a); } }
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