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Increment and Decrement Operators
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The increment (++) and decrement (--) operators are two operators you might not have seen used outside of Java programming circles Two aspects of these operators may seem unusual First, each operator s symbol is a combination of two other operators The increment operator uses two addition symbols, and the decrement operator uses two subtraction symbols The other unusual feature is that both use one operand That is, they are unary operators The increment operator adds 1 to the value of its operand and then assigns the sum to the operand The decrement operator subtracts 1 from its operand and then assigns the difference to the operand Both operators are illustrated in the next example
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First, the value 5 is assigned to the variable a, which is then displayed on the screen The increment operator then increases the value of variable a by 1 Variable a is then displayed on the screen once again The decrement operator then decreases the value of variable a by 1, and it is again displayed on the screen
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class Demo { public static void main (String args[]) { int a = 5; Systemoutprintln ("Initial value: " + a); a++; Systemoutprintln ("increment operator: " + a); a--; Systemoutprintln ("decrement operator: " + a); } }
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The increment and decrement operators can be placed on either side of the operand Their position tells Java when to add 1 to and subtract 1 from the operand Placing the increment or decrement operator on the left of the operand tells Java to increment or decrement the operand before performing any additional operation on the operand Placing the increment or decrement operator on the right of the operand tells Java to increment or decrement the operand after performing any additional operations on the operand This is a bit confusing, especially when you view the previous example, because only one operation is being performed with the operand It doesn t make any difference where you place the increment or decrement operator because you always end up with the same result However, the increment and decrement operators are commonly used in compound expressions where the positions of these operators have a material effect on the result of the expression, as you ll see in the next example Notice the first expression that uses the increment operator (b = a++) What is the value of variable b What is the value of variable a Variable b is assigned the value of variable a before Java increments the value of variable a Therefore, variable b is assigned the value 5 and variable a is then incremented by 1 to have a value 6 However, the operation changes in the second expression that uses the increment operator (b = ++a) Remember that before this statement executes, variable b has the value 5 and variable a has the value 6 Because the increment operator appears to the left of variable a, Java increments the value of variable a before assigning its value to variable b After this statement executes, variable a has the value 7 and variable b is assigned the value 7 The position of the decrement operator has a similar effect as the increment operator See if you can determine the value of variable a and variable b each
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time the decrement operator is used in the next example Run the example to check your answers
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class Demo { public static void main (String args[]) { int a = 5, b = 0; Systemoutprintln ("Initial value: a = " + a + " b = + b); b = a++; Systemoutprintln (" b = a++ value: a = " + a + " b = + b); b = ++a; Systemoutprintln ("b = ++a value: a = " + a + " b = + b); b = a--; Systemoutprintln ("b = a-- value: a = " + a + " b = + b); b = --a; Systemoutprintln ("b = --a value: a = " + a + " b = + b); } }
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Here are the rules for using the increment and decrement operators:
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