#include<iostream.h>    // For I/O Operations
#include<conio.c>       // For Console Operations
#include<math.h>
 
// Template Class Definition
 
// Template Class Name
 
template <class T>
//Triangle class definition
class Rectangle
{
//hidden part of the class
    private:
        T width();
 
	    T length;
 
        //data member of template type named Perm for perimeter of the rectangle
        T perm;
 
//Interface of the class
    public:
 
    //member function to find the area of Tirangle
        float area();
 
    //member function to find the perimeter of Triangle
        T perimeter();
 
 
    //member function to display the values
        void display();
 
    //member function to input the data values
        void input();
 
    //member function to set width   
        void width();
 
    //member function to get width  
        T getwidth();
 
    //member function to set lenght  
        void lenght(T);
 
    //member function to get lenght 
        T getlenght();
 
    //constructor
        Rectangle();
 
    //destructor
        ~Rectangle();        
};
 
//setter function of lenght
template <class T>
 
void Rectangle<T>::setlenght(T l)
 
{
    //setting lenght
    lenght = l;
}
 
 
//setter function of width
template <class T>
 
void Rectangle<T>::setwidth(T w)
 
{
    //setting width
    width = w;
}
 
//constructor definition to initiailize data members
template <class T>
 
//constructors definition
Rectangle<T>::Rectangle()
 
{
        //initializing lenght 
        lenght = 0;
        //initializing widthp 
        width = 0;
        //initializing Perm1 
        perm = 0;
}
 
//input function to take input 
template <class T>
{
    //display message to take input 
        cout<<"\t\tlenght of rectangle:\t\t";
    //taking input of lenght
        cin>>lenght;
 
    //display message to take input 
        cout<<"\n\t\twidth of rectangle:\t\t";
    //taking input of width
        cin>>width;
 
    //calling display
    display();
 
}
 
 
//display function to display input values
template <class T>
 
//displaying values
void Rectangle <T>::display()
 
{
    //displaying lenght of the Triangle entered by user
    cout<<"\nLenght of the Rectangle is:\t"<<getlenght(); 
 
    //displaying base of the Triangle entered by user
    cout<<"\nWidth of the Rectangle is:\t\t"<<getwidth(); 
 
 
 
    //calling and displaying area of the Rectangle
    cout<<"\nArea of the Rectangle is:\t\t"<<area();
 
    //calling perimeter and assigning to perm
    perm = perimeter();
 
    //displaying perimeter of the Rectangle
        cout<<"\nPerimeter of the Rectangle is:\t\t"<<perm;
 
}
 
//area function to calculate area     
template <class T>
 
//calculating area
 
float Rectangle <T>::area()
{
 
    //returning ares of the Rectangle
    return (length * width);
}
 
//perimeter function to calculate perimeter  
template <class T>
 
//calculate perimeter
T Rectangle <T>::perimeter()
{
 
    //returning perimeter of the Rectangle
    return (2 *(length + width);
}
 
//main function    
 
void main()
 
{
 
    // creating the object of Rectangle with int as it's data type
    Rectangle<int> T;
 
    // creating the object of Rectangle with float as it's data type
    Rectangle<float> T;
 
    // creating the object of Rectangle with double as it's data type
    Rectangle<double> T;
 
    cout<<"\nEnter the length of the rectangle as integer:\n\n";
    //calling input function of T
    T. input();
    cout<<"\t__________________________________\n";
    cout<<"\nEnter the width of the rectangle as integer:\n\n";
    //calling input function 
    T. input();
    cout<<"\nEnter the length of the rectangle as float:\n\n";
    //calling input function of T
    T. input();
    cout<<"\t__________________________________\n";
    cout<<"\nEnter the width of the rectangle as float:\n\n";
    //calling input function 
    T. input();
    cout<<"\nEnter the length of the rectangle as double:\n\n";
    //calling input function of T1
    T. input();
    cout<<"\t__________________________________\n";
    cout<<"\nEnter the width of the rectangle as double:\n\n";
    //calling input function 
    T. input();
 
getch();
 
}//end main

 
#include<iostream> // For I/O Operations//<--Dieter : use iostream
//conio.C ?????
//math.h is not used in your code. Furthermore, the right name is <cmath>
using namespace std;
 
// Template Class Definition
 
// Template Class Name
 
template <class T>
//Triangle class definition
class Rectangle
{
//hidden part of the class
private:
T width; //<--Dieter : brackets removed
 
T length;
 
T perm;//Dieter : the perm parameter is useless
 
//Interface of the class
public:
 
//member function to find the area of Tirangle
T area(); //<--Dieter: why use float when you write a template class ?
 
//member function to find the perimeter of Triangle
T perimeter();
 
 
//member function to display the values
void display();
 
//member function to input the data values
void input();
 
//member function to set width
void setwidth(T);//Dieter : its better when you can input something
 
//member function to get width
T getwidth();
 
//member function to set lenght
void setlenght(T);
 
//member function to get lenght
T getlenght();
 
//constructor
Rectangle();
 
//destructor
~Rectangle();
 
};
 
//setter function of lenght
template <class T>
void Rectangle<T>::setlenght(T l)
{
//setting lenght
length= l; //<--syntax error
}
 
 
//setter function of width
template <class T>
 
void Rectangle<T>::setwidth(T w)
 
{
//setting width
width = w;
}
 
//constructor definition to initiailize data members
template <class T>
 
//constructors definition
Rectangle<T>::Rectangle()
 
{
//initializing lenght
length= 0;
//initializing widthp
width = 0;
//initializing Perm1
perm = 0;
}
 
//input function to take input
template <class T>
void Rectangle<T>::input() //<--Dieter : this line was missing
{
//display message to take input
cout<<"\t\tlenght of rectangle:\t\t";
//taking input of lenght
cin>>length;//Dieter : syntax error
 
//display message to take input
cout<<"\n\t\twidth of rectangle:\t\t";
//taking input of width
cin>>width;
 
//calling display
display();
 
}
 
 
//display function to display input values
template <class T>
 
//displaying values
void Rectangle <T>::display()
 
{
//displaying lenght of the Triangle entered by user
cout<<"\nLenght of the Rectangle is:\t"<<getlenght();
 
//displaying base of the Triangle entered by user
cout<<"\nWidth of the Rectangle is:\t\t"<<getwidth();
 
 
 
//calling and displaying area of the Rectangle
cout<<"\nArea of the Rectangle is:\t\t"<<area();
 
//calling perimeter and assigning to perm
perm = perimeter();
 
//displaying perimeter of the Rectangle
cout<<"\nPerimeter of the Rectangle is:\t\t"<<perm<<"\n";
 
}
 
//area function to calculate area
template <class T>
 
//calculating area
 
T Rectangle <T>::area()
{
 
//returning ares of the Rectangle
return (length * width);
}
 
//perimeter function to calculate perimeter
template <class T>
 
//calculate perimeter
T Rectangle <T>::perimeter() //<--Dieter : changed this line too.
{
 
//returning perimeter of the Rectangle
return (2 *(length + width)); //<--Dieter added closing bracket.
}
 
//<--Dieter : your destructor was declared but never defined
template <class T>
Rectangle<T>::~Rectangle()
{
}
 
//<--Dieter : the getters getlenght and getwidth are not defined
template <class T>
T Rectangle<T>::getlenght()
{
	return length;
}
 
template <class T>
T Rectangle<T>::getwidth()
{
	return width;
}
 
 
//main function
 
int main() //<--Dieter :main must return an int
 
{
 
// creating the object of Rectangle with int as it's data type
Rectangle<int> Ti;  //Dieter your 3 objects CANT HAVE THE SAME NAME !!!
 
// creating the object of Rectangle with float as it's data type
Rectangle<float> Tf;
 
// creating the object of Rectangle with double as it's data type
Rectangle<double> Td;
 
//<--Dieter : see modifications below
 
cout<<"\nEnter the length of the rectangle as integer:\n\n";
//calling input function of T
Ti. input();
cout<<"\t__________________________________\n";
cout<<"\nEnter the length of the rectangle as float:\n\n";
//calling input function of T
Tf. input();
cout<<"\t__________________________________\n";
cout<<"\nEnter the length of the rectangle as double:\n\n";
//calling input function of T1
Td. input();
 
cout<<"Press [enter]."<<endl;
getch();
 
}//end main