This print for content only-size & color not accurate 7" X 9-1/4" / casebound / malloy

// Store sum in an int to prevent overflow.

byte b1 = 100;

byte b2 = 250;

int sum = (byte)Add(b1, b2);

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8849CH03.qxd  9/24/07  11:07 AM  Page 97

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Of course, the problem with this technique is the simple fact that you are human, and even

your best attempts may result in errors that have escaped your eyes. Given this, C# provides the

checked keyword. When you wrap a statement (or a block of statements) within the scope of the

checked keyword, the C# compiler emits additional CIL instructions that test for overflow condi-

tions that may result when adding, multiplying, subtracting, or dividing two numerical data types.

If an overflow has occurred, you will receive a runtime exception (System.OverflowException to

be exact). Chapter 7 will examine all the details of structured exception handling and the use of the

try and catch keywords. Without getting too hung up on the specifics at this point, observe the fol-

lowing update:

static void ProcessBytes()

{

byte b1 = 100;

byte b2 = 250;