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Increment and Decrement Increment and Decrement Increment and Decrement Increment and Decrement The increment and decrement operators can be applied in prefix form (before the operand) or postfix form (after the operand) The increment operator (++) adds one to its operand The decrement operator (--) subtracts one from its operand When used alone in a statement, the prefix and postfix forms are functionally equivalent. That is, The statement count++; count++; is equivalent to is functionally equivalent to ++count; count = count + 1; When used in a larger expression, the prefix and postfix forms have different effects 30 29 Assignment Operators Assignment Operators Increment and Decrement Increment and Decrement Often we perform an operation on a variable, and then store the result back into that variable If count currently contains 45, then the statement total = count++; Java provides assignment operators to simplify that process assigns 45 to total and 46 to count For example, the statement If count currently contains 45, then the statement num += count; total = ++count; is equivalent to assigns the value 46 to both total and count num = num + count; 32 31
Assignment Operators Assignment Operators Assignment Operators Assignment Operators The right hand side of an assignment operator can be a complex expression There are many assignment operators, including the following: The entire right-hand expression is evaluated first, then the result is combined with the original variable Equivalent To Example Operator Therefore result /= (total-MIN) % num; is equivalent to x = x + y x = x - y x = x * y x = x / y x = x % y x += y x -= y x *= y x /= y x %= y += -= *= /= %= result = result / ((total-MIN) % num); 34 33 The for Statement The for Statement Repetition Statements Repetition Statements The for statement has the following syntax: Repetition statements allow us to execute a statement multiple times executed until the condition becomes false executed once before the loop begins Often they are referred to as loops Java has three kinds of repetition statements: for ( initialization ; condition ; update ) statement; • the for loop • the while loop • the do loop Each kind of loop works slightly differently executed at the end of each iteration The condition-statement-update cycle is executed repeatedly 36 35
Page 1 and 2: Outline Conditional Statements •
Page 3 and 4: Block Statements Block Statements T
Page 5 and 6: The switch Statement The switch Sta
Page 7: Comparing Strings Comparing Strings
Page 11 and 12: The while Statement The while State
Page 13: Choosing a Loop Structure Choosing

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