Chapter 6 Methods 187 Common Programming Error 6.7 (Photo web hosting)
Chapter 6 Methods 187 Common Programming Error 6.7 Placing a semicolon after the right parenthesis enclosing the parameter list of a method definition is a syntax error. Common Programming Error 6.8 Redefining a method parameter in the method s body is a syntax error. Common Programming Error 6.9 Passing to a method an argument that is not compatible with the corresponding parameter s type is a syntax error. The declarations and statements within braces form the method body. The method body is also referred to as a block. As discussed previously, a block is a set of declarations and statements enclosed in curly braces. Variables can be declared in any block, and blocks can be nested. Common Programming Error 6.10 Defining a method inside another method is a syntax error (i.e., methods cannot be nested). Good Programming Practice 6.3 Choosing meaningful method names and parameter names makes programs more readable and helps avoid excessive use of comments. Software Engineering Observation 6.6 As a rule of thumb, a method should be no longer than one page. Better yet, a method should be no longer than half a page. Regardless of how long a method is, it should perform one task well. Small methods promote software reusability. Testing and Debugging Tip 6.1 Small methods are easier to test, debug and understand than large methods. Software Engineering Observation 6.7 A method requiring a large number of parameters may be performing too many tasks. Consider dividing the method into smaller methods that perform separate tasks. As a rule of thumb, the method header should fit on one line (if possible). Software Engineering Observation 6.8 The number, type and order of arguments in a method call must exactly match those of the parameters in the corresponding method header. There are three ways to return control to the point at which a method was invoked. If the method does not return a result (i.e., the method has a voidreturn type), control returns when the program reaches the method-ending right brace or when the statement return; executes. If the method does return a result, the statement return expression;
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