how to use TEMPLATE in C++

I am new in C++, and learning the langauge by my self only, while practicing i come across one question for which i have no idea, the question is to calculate area and perimeter of rectangle, the code i wrote was

#include <iostream> using namespace std; int main () { // declaration of variables float length; //length of a rectangle float width; //width of a rectangle float area; //area of a rectangle float perim; //perimeter of a rectangle // prompt for and read the input values cout << "Enter the length of the rectangle" << endl; cin >> length; cout << "Enter the width of the rectangle" << endl; cin >> width; //Calculate the area and the perimeter area = length*width; perim = 2.0*length + 2.0*width; //Display the result cout << "The area is " << area << endl; cout << "The perimeter is " << perim << endl;

return 0;

}

BUT I WHAT I NEED IS

The program will read the values of length and width from the user trough keyboard and passes these values to the function calculate(T x, T y). The function calculates the area and perimeter of the rectangle and displays the result on the screen. The function returns no value.

Can someone HELP?

thankx

easy

template<class T>
void calculate(T x, T y)
{
  // calculate your area
  cout << (x*y);
  // calculate perimeter
  cout << (2*x+2*y);
}
 
int main()
{
// ... your code to input ..
  calculate(x,y);
}

The

bit defines a general type, T. For all practical purposes simply image the T is saying 'double', or
'float', or 'int'.. So everywhere you need a type within your calculate function of this generic
type, put T instead.
The neat bit is the compiler figures out what type to assign when compiling by looking at the type
of the variables you pass to the function.
 
 
\code
 
int x, y;
// assign values
calculate(x,y);  // T in the calculate function is a integer

float x, y;
// assign values
calculate(x,y);  // T in the calculate function is a float

etc.