Polymorphism is the
ability to more than one function have same name, but different content, for a
related class. These function are called “overloaded functions”.
Overloaded function
differentiate by the type or numbers of argument and not on its return type.
In the example we
have three functions with same name as “area()”, but all three differ on the
basis of arguments. Where first one passed with one Integer argument, second
function with two Integer and the third one also having one argument but float
type. Therefore, even first and third function both have only one argument but
the third is having a different data type than the first one. Function overloading nothing to do with its
return type.
Example of Function
Overloading. Three function defined with same name but differ only on the basis
of argument.
#include
<iostream.h>
#include
<conio.h>
class test
{
public:
void area(int);
void area(int,int);
void area(float);
};
void test::area(int S)
{
int ans=S*S;
cout<<"\nThe
Area od Square
}
void test::area(int L, int B)
{
int ans=L*B;
cout<<"\nThe
Area of Rectangle "<<ans;
}
void test:: area(float radius)
{
float
ans=3.14*pow(radius,2);
cout<<"\nThe
area of Circle is = "<<ans;
}
void main()
{
clrscr();
int a,b;
float r;
test t;
cout<<"Enter
side : ";
cin>>a;
cout<<"Enter
Length & Breadth : ";
cin>>a>>b;
cout<<"enter the
radius "<<endl;
cin>>r;
t.area(a);
t.area(a,b);
t.area(r);
getch();
}
Adding two values
of combination integer and float.
#include
<iostream.h>
#include
<conio.h>
class fo
{
public :
void
cal(int,int);
void
cal(int,float);
void
cal(float,float);
};
void fo::cal(int a,int b)
{
cout<<"Sum
of"<<a<<"and"<<b<<"="<<a+b<<endl;
}
void fo::cal(int a,float b)
{
cout<<"\n\tsum
of"<<a<<"and"<<b<<"="<<a+b<<endl;
}
void fo::cal(float a,float b)
{
cout<<"\n\tsum
of"<<a<<"and"<<b<<"="<<a+b<<endl;
}
void main()
{
int a,b;
float x,y;
cout<<"\n\tEnter
two integer value: ";
cin>>a>>b;
cout<<"\n\tnter two float
value:";
cin>>x>>y;
fo f;
f.cal(a,b);
f.cal(a,x);
f.cal(x,y);
getch();
}
Using function
overloading to create substring function one like in java.
#include
<iostream.h>
#include
<conio.h>
class Fun_Ovl
{
private:
char Str[50];
public:
void input();
void disp();
Fun_Ovl
substr(int);
Fun_Ovl
substr(int,int);
};
void Fun_Ovl:: input()
{
cout<<"\n\tEnter
a Strinbg : ";
cin.getline(Str,50);
}
Fun_Ovl Fun_Ovl::substr(int S)
{
Fun_Ovl
F1;
int
i,j=0;
for(i=0;i<50;i++)
{
F1.Str[i]='\0';
}
for(i=S;Str[i]!='\0';i++)
{
F1.Str[j++]=Str[i];
}
return F1;
}
Fun_Ovl Fun_Ovl::substr(int S, int E)
{
Fun_Ovl F1;
int i,j=0;
for(i=0;i<50;i++)
{
F1.Str[i]='\0';
}
for(i=S-1;i<E;i++)
{
F1.Str[j++]=Str[i];
}
return F1;
}
void Fun_Ovl:: disp()
{
cout<<"\n\t"<<Str<<"\n";
}
void main()
{
clrscr();
int s,e;
Fun_Ovl
f,f1,f2;
f.input();
cout<<"\n\tEnter Starting
Postion of String : ";
cin>>s;
cout<<"\n\tEnter
Enter End Position of the String : ";
cin>>e;
f1=f.substr(s);
cout<<"\n\tOriginal
String : ";
f.disp();
cout<<"\n\tSubstring
from position "<<s<<" to End ";
f1.disp();
f1=f.substr(s,e);
cout<<"\n\tSubstring between
"<<s<<" to "<<e;
f1.disp();
getch();
}
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