By Jean Ettinger MSc CEng (auth.)
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Programming in C+ + 42 In the following example program, an array with identifier group whose components are three objects with type record is declared with the statement: record group [ MAX RECORDS] i A pointer with the record referenced type is declared with the statement: record* Pi There are two operators that can be used to access the members of a struct object: the direct selection operator • (the 'dot' operator), and the indirect selection operator - > . 1 The direct selection operator The direct selection operator has two operands: the left operand is the objecUdentifier and the right operand is the member_identifier selected.
This means that changes made to the argument data object inside the function are known to the calling function. The types of the arguments passed by reference in the formal argument list are either a reference type (type&) or a pointer referenced type (type·). Functions 49 Arrays are always passed by reference to functions since an array identifier is a constant pointer whose referenced type is the type of its components. To prevent changes being made to the components of an array, the array can be made a constant object.
This means that the data objects declared by the second function also disappear: they exist only while the called function is executing. ). The function round ( ) is used instead of the manipulator setprecision( 2 ). 50. 1S75. 6875. ). So this new cost is made the actual argument of the function round( ). It replaces the formal argument x of this function. 5 ). 25. This is now converted to a long integer value, so that the value of y is 1469 (losing the fractional part). 0. 0. 69. This is then assigned to cost, in the statement cost = round( ), so that it can be output as required.