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ssrs ean 128 CHAP. 91 in Software
CHAP. 91 Recognizing Quick Response Code In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Denso QR Bar Code Creation In None Using Barcode maker for Software Control to generate, create QR image in Software applications. OVERLOADING
QRCode Recognizer In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. Creating Quick Response Code In C# Using Barcode printer for .NET framework Control to generate, create QRCode image in .NET applications. OPERATORS
QR Maker In Visual Studio .NET Using Barcode generation for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications. Printing QR Code ISO/IEC18004 In VS .NET Using Barcode maker for Visual Studio .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications. int& { Creating QR In VB.NET Using Barcode creator for VS .NET Control to generate, create QR Code 2d barcode image in .NET framework applications. GTIN  13 Drawer In None Using Barcode creator for Software Control to generate, create GTIN  13 image in Software applications. Rational: :operator[] (int i) if (i == 1) return num; if (i == 2) return den; cerr c< "ERROR: index out of range\n"; exit(O); Encode Barcode In None Using Barcode generator for Software Control to generate, create bar code image in Software applications. Making ECC200 In None Using Barcode encoder for Software Control to generate, create Data Matrix ECC200 image in Software applications. The expression x [ 1 ] calls the subscript operator, passing 1 to i, which returns x . num. Similarly, x [ 2 ] returns x . den. If i has any value other than 1 or 2, then an error message is sent to cerr, the standard error stream, and then the exi t ( ) function is called. This example is artificial. There is no advantage to accessing the fields of the Rat ional object x with x [ 1 ] and x [ 2 ] instead of x . num and x . den. However, there are many important classes where the subscript is very useful. (See Problem 9.14.) Note that the subscript operator is an access function, since it provides pub1 ic access to private member data. GS1 128 Generation In None Using Barcode generator for Software Control to generate, create EAN / UCC  14 image in Software applications. Bar Code Drawer In None Using Barcode encoder for Software Control to generate, create barcode image in Software applications. Review Questions
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UPCA Printer In ObjectiveC Using Barcode creator for iPad Control to generate, create UPC Code image in iPad applications. Print Barcode In Java Using Barcode maker for BIRT reports Control to generate, create barcode image in BIRT reports applications. Why can t the this pointer be used in nonmember functions Why should the overloaded assignment operator return * this What is the difference between the effects of the following two declarations: Rational y(x); Rational y = x; What is the difference between the effects of the following two lines: Rational y = x; Rational y; y = x; 9.7 Why can t * * be overloaded as an exponentiation operator
9.8 9.9 9.10 Why should the stream operators CC and >> be overloaded as friend functions Why should the arithmetic operators +, 9 *, and / be overloaded as friend functions
How is the overloaded preincrement operator distinguished from the overloaded postincrement operator 9.11 Why is the int argument in the implementation of the postincrement operator left unnamed 9.12 What mechanism allows the overloaded subscript operator [ ] to be used on the left side of an
assignment statement, like this: v [ 2 ] = 2 2 OVERLOADING
OPERATORS
[CHAP. 9
Solved Programming Problems
9.13 Implement the binary subtraction operator, the unary negation operator, and the lessthan operator < for the Rational class (see Example 9.1). All three of these operators are implemented as friend and den data members of their owner objects: functions to give them access to the num class Rational { friend Rational operator(const Rational&, const Rational&); friend Rational operator(const Rational&); friend int operator<(const Rational&, const Rational&); public: Rational(int =0, int =l); Rational(const Rational&); Rational& operator=(const Rational&); // other declarations go here private: int num, den; int gcd(int, int) int reduce(); > ; The binary subtraction operator simply constructs and returns a Rational object z that represents the difference x  y: Rational Rational: :operator(const Rational& x, const Rational& y) x.den*y.den); Rational z(x.num*y.den z.reduce(); return z; y.num*x.den, Algebraically, the subtraction a/b  c/d is performed using the common denominator bd: a c adbc bd = a So the numerator of x  y shouldbe x.num*y.den  y . num*x . den and the denominator should be x . den*y . den. The function constructs the Rational object z with that numerator and denominator. This algebraic formula can produce a fraction that is not in reduced form, even if x and y are. For example, l/2  l/6 = (1*6  2=1)/(2*6) = 4/12. So we call the reduce ( ) utility function before returning the resulting object z. The unary negation operator overloads the symbol  . It is distinguished from the binary subtraction operator by its parameter list; it has only one parameter: Rational Rational: :operator(const t Rational y(x.num, x.den); return y; Rational& x) To negate a fraction a/b we simply negate its numerator: (a)lb. So the newly constructed object y has the same denominator as x but its numerator is x.num. Rational
CHAP. 91
OVERLOADING
OPERATORS
The lessthan operator is easier to do if we first modify our default constructor to ensure that every object s den value is positive. Then we can use the standard equivalence for the lessthan operator:

