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The uses of prefix and postfix notation shows both a strength and a weakness of the C language. On the plus side, C allows you to accomplish a lot in a small amount of code. In our examples, we changed the value of two different variables in a single statement. C is powerful. On the downside, C code written in this fashion can be extremely cryptic and difficult to read for even the most seasoned C programmer. Write your code carefully.
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The += and -= Operators
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In C, you can place the same variable on both the left and right sides of an assignment statement. For example, the following statement increases the value of myInt by 10:
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myInt = myInt + 10;
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CHAPTER 5: C Basics: Variables and Operators
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The same results can be achieved using the += operator. In other words,
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myInt += 10;
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is the same as
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myInt = myInt + 10;
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In the same way, the -= operator can be used to decrement the value of a variable. The statement
myInt -= 10;
decrements the value of myInt by 10.
The *, /, *=, and /= Operators
The multiplication (*) and division (/) operators each take two values and reduce them to a single value, much the same as the + and - operators do. The following statement
myInt = 3 * 5;
multiplies 3 and 5, leaving myInt with a value of 15. This statement
myInt = 5 / 2;
divides 5 by 2, and assuming myInt is declared as an int (or any other type designed to hold whole numbers), assigns the integral (truncated) result to myInt. The number 5 divided by 2 is 2.5. Since myInt can only hold whole numbers, the value 2.5 is truncated and the value 2 is assigned to myInt.
NOTE
Math alert! Numbers like 37, 0, and 22 are known as whole numbers or integers. Numbers like 3.14159, 2.5, and .0001 are known as fractional or floating point numbers.
The *= and /= operators work much the same as their += and -= counterparts. The statement
myInt *= 10;
is identical to the statement
myInt = myInt * 10;
CHAPTER 5: C Basics: Variables and Operators
Similarly, this statement
myInt /= 10;
is identical to this one:
myInt = myInt / 10;
NOTE
The / operator doesn t perform its truncation automatically. The accuracy of the result is limited by the data type of the operands. As an example, if the division is performed using ints, the result will be an int and is truncated to an integer value. Several data types (such as float) support floating point division using the / operator. We ll get to them later in this book.
To wrap up this discussion, it is worth mentioning that most C programmers prefer the shortcut version of each of the operators we just covered. For example, most C programmers would use
myInt++; myInt /= 2;
instead of
myInt = myInt + 1; myInt = myInt / 2;
Both chunks of code will accomplish the same result. Use what you think will be easiest for you to read late at night, with lots of caffeine coursing through your system, and a steady stream of e-mails coming in from a client or boss demanding that you finish this project immediately cause that s when your coding choices will matter most.
Using Parentheses
Sometimes the expressions you create can be evaluated in several ways. Here s an example:
myInt = 5 + 3 * 2;
You can add 5 + 3 and then multiply the result by 2 (giving you 16). Alternatively, you can multiply 3 by 2 and add 5 to the result (giving you 11). Which is correct C has a set of built-in rules for resolving the order of operators. As it turns out, the * operator has a higher precedence than the + operator, so the multiplication will be performed first, yielding a result of 11.
CHAPTER 5: C Basics: Variables and Operators
Though it helps to understand the relative precedence of the C operators, keeping track of them all is hard. That s why the C gods gave us parentheses! Use parentheses in pairs to define the order in which you want your operators performed. The following statement
myInt = ( 5 + 3 ) * 2;
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