186 Methods Chapter 6 value, so that code (Ftp web hosting)
186 Methods Chapter 6 value, so that code in the method body can use the value. Keyword int, which precedes the method name, indicates that method Square returns an integer result. The return statement in Square(line 26) passes the result of the calculation y*y back to the calling statement. Note that the entire method definition appears inside the braces of class SquareInt. All methods must be defined inside a class definition. Good Programming Practice 6.2 Place a blank line between method definitions to separate the methods and enhance program readability. Common Programming Error 6.2 Defining a method outside the braces of a class definition is a syntax error. The format of a method definition is return-value-type method-name( parameter-list ) { declarations and statements } The first line is sometimes known as the method header. The method-name is any valid identifier. The return-value-type is the data type of the result that the method returns to its caller. The return-value-type void indicates that a method does not return a value. Methods can return at most one value. Common Programming Error 6.3 Omitting the return-value-type in a method definition is a syntax error. If a method does not return a value, the method s return-value-type must be void. Common Programming Error 6.4 Forgetting to return a value from a method that is supposed to return a value is a syntax error. If a return-value-type other than void is specified, the method must contain a return statement that returns a value. Common Programming Error 6.5 Returning a value from a method whose return type has been declared void is a syntax error. The parameter-list is a comma-separated list in which the method declares each parameter s type and name. The method call must specify one argument for each parameter in the method definition and the arguments must appear in the same order as the parameters in the method definition. The arguments also must be compatible with the parameter s type. For example, a parameter of type double could receive values of 7.35, 22 or .03546, but not “hello” because a double variable cannot contain a string. If a method does not receive any values, the parameter list is empty (i.e., the method name is followed by an empty set of parentheses). Each parameter in a method s parameter list must have a data type; otherwise, a syntax error occurs. Common Programming Error 6.6 Declaring method parameters of the same type as float x, y instead of float x, float y is a syntax error, because types are required for each parameter in the parameter list.
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