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2010-05-25T14:21:06Z

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2010-05-25T10:25:31Z

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==Address class: class definition and implementation==

<source lang="cpp">
#include <iostream>
#include <cstring>
using namespace std;
class Address {
char name[40];
char street[40];
char city[30];
char state[3];
char zip[10];
public:
void store(char *n, char *s, char *c, char *t, char *z);
void display();
};
void Address::store(char *n, char *s, char *c, char *t, char *z)
{
strcpy(name, n);
strcpy(street, s);
strcpy(city, c);
strcpy(state, t);
strcpy(zip, z);
}
void Address::display()
{
cout << name << endl;
cout << street << endl;
cout << city << endl;
cout << state << endl;
cout << zip << endl;
}
int main()
{
Address a;
a.store("C", "11 Lane", "W", "In", "4");
a.display();
return 0;
}

</source>

==A simple class with member variable, constructor, destructor==

<source lang="cpp">
#include <iostream>
using namespace std;
class who {
char name;
public:
who(char c) {
name = c;
cout << "Constructing who";
cout << name << endl;
}
~who() {
cout << "Destructing who: " << name << endl;
}
};
who makewho()
{
who temp("B");
return temp;
}
int main()
{
who ob("A");
makewho();
return 0;
}

</source>

==Assign object1 to object2==

<source lang="cpp">
#include <iostream>
using namespace std;
class BaseClass {
int a;
public:
void load_a(int n) {
a = n;
}
int get_a() {
return a;
}
};
class DerivedClass : public BaseClass {
int b;
public:
void load_b(int n) {
b = n;
}
int get_b() {
return b;
}
};
int main()
{
DerivedClass object1, object2;
object1.load_a(5);
object1.load_b(10);

object2 = object1;
cout << "Here is object1"s a and b: ";
cout << object1.get_a() << " " << object1.get_b() << endl;
cout << "Here is object2"s a and b: ";
cout << object2.get_a() << " " << object2.get_b() << endl;
return 0;
}

</source>

==Class forward declaration==

<source lang="cpp">
#include <iostream>
using namespace std;
class pr2; //
class pr1 {
int printing;

public:
pr1() {
printing = 0;
}
void set_print(int status) {
printing = status;
}

friend int inuse(pr1 object1, pr2 object2);
};
class pr2 {
int printing;

public:
pr2() {
printing = 0;
}
void set_print(int status) {
printing = status;
}

friend int inuse(pr1 object1, pr2 object2);
};
int inuse(pr1 object1, pr2 object2)
{
if(object1.printing || object2.printing) return 1;
else return 0;
}
int main()
{
pr1 p1;
pr2 p2;
if(!inuse(p1, p2))
cout << "Printer idle\n";
cout << "Setting p1 to printing...\n";
p1.set_print(1);
if(inuse(p1, p2))
cout << "Now, printer in use.\n";
cout << "Turn off p1...\n";
p1.set_print(0);
if(!inuse(p1, p2))
cout << "Printer idle\n";
cout << "Turn on p2...\n";
p2.set_print(1);
if(inuse(p1, p2))
cout << "Now, printer in use.\n";
return 0;
}

</source>

==Declare class instance==

<source lang="cpp">
#include <iostream>
using namespace std;
class myclass {
int a;
public:
myclass(int x) {
a = x;
}
int geta() {
return a;
}
};

int main()
{
myclass ob(4);
cout << ob.geta();
return 0;
}

</source>

==Declare Class instance and use them==

<source lang="cpp">
#include <iostream>
#include <cstring>
using namespace std;
class Book {
char title[80]; // book title
char author[40]; // author
int number; // number in library
public:
void store(char *t, char *name, int num);
void show();
};
void Book::store(char *t, char *name, int num)
{
strcpy(title, t);
strcpy(author, name);
number = num;
}
void Book::show()
{
cout << "Title: " << title << endl;
cout << "Author: " << author << endl;
cout << "Number on hand: " << number << endl;
}
int main()
{
Book book1, book2, book3;
book1.store("D", "t", 2);
book2.store("T", "v", 2);
book3.store("T", "e", 1);
book1.show();
book2.show();
book3.show();
return 0;
}

</source>

==Init Object array==

<source lang="cpp">
#include <iostream>
using namespace std;
class CharClass {
char ch;
public:
CharClass(char c) {
ch = c;
}
char get_ch() {
return ch;
}
};
int main()
{
CharClass ob[10] = {
CharClass("a"),
CharClass("b"),
CharClass("c"),
CharClass("d"),
CharClass("e"),
CharClass("f"),
CharClass("g"),
CharClass("h"),
CharClass("i"),
CharClass("j")
};
int i;
for(i = 0; i <10; i++)
cout << ob[ i ].get_ch() << " ";
cout << endl;
return 0;
}

</source>

==Simplest class definition==

<source lang="cpp">
#include <iostream>
using namespace std;
class SimpleClass {
int len;
public:
SimpleClass(int l);
};
SimpleClass::SimpleClass(int l)
{
len = l;
int i;
for(i = 0; i <len; i++)
cout << "*";
}
int main()
{
SimpleClass l(10);
return 0;
}

</source>

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