в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:29:25Z

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==Accessor functions==

<source lang="cpp">#include <iostream>
class MyClass {
public: // begin public section
int getInt(); // accessor function
void setint (int age); // accessor function
void display(); // general function
private: // begin private section
int itsAge; // member variable
};

int MyClass::getInt()
{
return itsAge;
}

void MyClass::setint(int age)
{
itsAge = age;
}

void MyClass::display()
{
std::cout << "display.\n";
}

int main()
{
MyClass obj;
obj.setint(5);
obj.display();
std::cout << obj.getInt() << " years old.\n";
obj.display();
return 0;
}</source>
<pre class=codeResult>display.
5 years old.
display.</pre>

==Access private data through accessor functions.==

<source lang="cpp">#include <iostream>
#include <cstring>
using namespace std;

class Shape {
// private
double width;
double height;
public:

void display() {
cout << "Width and height are " << width << " and " << height << "\n";
}

// accessor functions
double getWidth() { return width; }
double getHeight() { return height; }
void setWidth(double w) { width = w; }
void setHeight(double h) { height = h; }
};

// Triangle is derived from Shape.
class Triangle : public Shape {
public:
char style[20];

double area() {
return getWidth() * getHeight() / 2;
}

void showStyle() {
cout << "Triangle is " << style << "\n";
}
};

int main() {
Triangle t1;
Triangle t2;

t1.setWidth(4.0);
t1.setHeight(4.0);
strcpy(t1.style, "isosceles");

t2.setWidth(8.0);
t2.setHeight(12.0);
strcpy(t2.style, "right");

t1.showStyle();
t1.display();
cout << "Area is " << t1.area() << "\n";

t2.showStyle();
t2.display();
cout << "Area is " << t2.area() << "\n";

return 0;
}</source>
<pre class=codeResult>Triangle is isosceles
Width and height are 4 and 4
Area is 8
Triangle is right
Width and height are 8 and 12
Area is 48</pre>

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C++ Tutorial/Class/accessor functions - История изменений

в 14:21, 25 мая 2010

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