ssrs ean 128 The syntax for overloading the input operator for a class in Software

Generating QR Code ISO/IEC18004 in Software The syntax for overloading the input operator for a class

The syntax for overloading the input operator for a class
Scanning QR Code JIS X 0510 In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing QR-Code In None
Using Barcode encoder for Software Control to generate, create QR Code JIS X 0510 image in Software applications.
friend istream& operator>>(istream& { return istr x= t.d; }
Reading QR Code JIS X 0510 In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Drawing QR Code 2d Barcode In Visual C#
Using Barcode printer for .NET framework Control to generate, create QR image in Visual Studio .NET applications.
with data member d is
Painting QR Code In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
Create Quick Response Code In .NET Framework
Using Barcode drawer for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
istr, T& t)
Generating QR Code ISO/IEC18004 In Visual Basic .NET
Using Barcode encoder for .NET framework Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
Create EAN-13 In None
Using Barcode encoder for Software Control to generate, create GS1 - 13 image in Software applications.
Here, is tream is another standard class defined (indirectly) in the ios tream . h header file. Here is an example of how custom input can be written:
Code 39 Extended Generator In None
Using Barcode creation for Software Control to generate, create Code 39 image in Software applications.
Drawing GTIN - 128 In None
Using Barcode maker for Software Control to generate, create EAN 128 image in Software applications.
OVERLOADING OPERATORS
Printing Barcode In None
Using Barcode maker for Software Control to generate, create bar code image in Software applications.
Generating Code128 In None
Using Barcode generation for Software Control to generate, create Code 128B image in Software applications.
[CHAP. 9
Code 2 Of 7 Encoder In None
Using Barcode creation for Software Control to generate, create 2 of 7 Code image in Software applications.
Painting Code 39 Extended In Java
Using Barcode printer for Java Control to generate, create Code39 image in Java applications.
EXAMPLE 9.9 Overloading the Input Operator >> in the Rat ional Class #include ciostream.h>
Printing GTIN - 12 In Java
Using Barcode maker for Eclipse BIRT Control to generate, create UPCA image in BIRT reports applications.
Generate 1D In .NET Framework
Using Barcode generation for .NET Control to generate, create Linear image in Visual Studio .NET applications.
class Rational { friend istream& operator>>(istream&, Rational&); const Rational&); friend ostream& operatorcc(ostream&, public: Rational(int n=O, int d=l) : num(n>, den(d) { } // other dec larations go here private: int num, den int gcd(int, int); void reduce( > ; > ; main0 Rational x, y; tin >> x >> y; tout CC 'x = ' CC x CC ', y = ' CC y C-C endl;
Encoding Data Matrix ECC200 In VS .NET
Using Barcode encoder for .NET framework Control to generate, create Data Matrix image in VS .NET applications.
Painting EAN13 In None
Using Barcode generator for Excel Control to generate, create European Article Number 13 image in Microsoft Excel applications.
istream&
Barcode Creator In .NET
Using Barcode generation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Make Code 39 Extended In None
Using Barcode printer for Microsoft Word Control to generate, create Code 3/9 image in Word applications.
operator>>(istream&
istr, Rational& "; ";
tout CC "\t Numerator: tout CC "\tDenominator: r.reduce(); return istr;
istr >> r.num; istr X= r.den;
This version of the input operator includes user prompts to facilitate input. It also includes a call to the utility function reduce ( ) . Note that, as a friend, the operator can access this private function.
9.8 CONVERSION OPERATORS In our original implementation of the Rat ional class (Example 8.1) we defined the member function convert ( > to convert from type Rational to type double:
double convert0 x.convert(); { return double(num)/den; }
This requires the member function to be called as In keeping with our goal to make objects of the Rat ional class behave like objects of fundamental types (i.e., like ordinary variables), we would like to have a conversion function that
CHAP. 91
OVERLOADING
OPERATORS
could be called with a syntax that conforms to ordinary type conversions:
n = int(t); Y = double(x);
This can be done with a conversion operator. Our Rat ional class already has the facility to convert an object from in t to Rat ional:
Rational x(22);
This is handled by the default constructor, which assigns 22 to X. num and 1 to X. den. This constructor also handles direct type conversions from type int to type Rat ional:
x = Rational(22);
Constructors of a given class are used to convert from another type to that class type. To convert from the given class type to another type requires a different kind of member function. It is called a conversion operator, and it has a different syntax. If type is the type to which the object is to be converted, then the conversion operator is declared as
operator type();
For example, a member function of the Rat ional I class that returns an equivalent float would be declared as
operator float();
Or, if we want it to convert to type double, then we would declare it as
operator double();
And, if we want it to be usable for constant RationalS (like pi), then we would declare it as
operator double0 const;
Recall that, in our original implementation of the Rat ional class (Example 8.1) we defined the member function convert ( > for this purpose.
EXAMPLE 9.10 #include Adding a Conversion Operator to the Rat ional <iostream.h> Class
class Rational { friend istream& operator>>(istream&, Rational&); friend ostream& operator<<(ostream&, const Rational&); public: Rational(int n=O, int d=l) : numb), den(d) { > operator double0 const; // other declarations go here private: int num, den; // other declarations go here > ; main0 Rational x(-5,8); tout << "x = H << x -CC ", double(x) = H C-C double(x) << endl; const Rational p(22,7); const double pi = double(p); tout << "p = H << p << II, pi = H << pi << endl;
OVERLOADING
OPERATORS
[CHAP. 9
Rational: :operator double0 -t return double(num)/den;
)& 5%
const
I =-
-5/8, doub2,e(x) = -0*;e;25 . 22,7,- pi ..= 3 .X4286 _
First we use the conversion operator double ( > to convert the Rat ional object x into the double -0.625. Then we use it again to convert the constant Rat ional object p into the constant double pi.
9.9 OVERLOADING THE INCREMENT AND DECREMENT OPERATORS
The increment operator + + and the decrement operator - - each have two forms: prefix and postfix. Each of these four forms can be overloaded. We ll examine the overloading of the increment operator here. Overloading the decrement operator works the same way. When applied to integer types, the pre-increment operator simply adds 1 to the value of the object being incremented. This is a unary operator: its single argument is the object being incremented. The syntax for overloading it for a class named T is simply
T So operator++();
Copyright © OnBarcode.com . All rights reserved.