need u r help

[savanh]

hello, i have this code and i dont know why it does not run .
the question is write the definition of the function template which exchanges two variables by taking the two variables as parameters and swaps them.
this is my try.

#include <iostream>
using namespace std;
template<typename T>
T swapp(T &num1, T &num2) {
     T temp=num1; 
     num1=num2;
     num2=temp;
	 return temp;
}

int main()
{
 int a =8;
  int b =4;
cout<<swapp(a,b); 
cout<<endl;
  double x = 2.3;
  double y = 4.5;
cout<<swapp(x,y);

 system("pause");
 return 0;

}

please help me with it
thank you all.

[keskiverto]

How can you tell that it does not work? You don't print the values of the two variable after the swap.

Why does the swapp return a value?

[booradley60]

Why does the "swapp" function return a value? When you call the function in the cout statement, you're going to print the return value and not the actual parameters. Try this in main:

int a = 8;
int b = 4;
cout<<"a = " << a << endl;
cout<<"b = " << b <<endl;
cout<<"Calling swap"<<endl;
swapp(a,b); 
cout<<"a = " << a << endl;
cout<<"b = " << b <<endl;

double x = 2.3;
double y = 4.5;
cout<<"x = " << x << endl;
cout<<"y = " << y <<endl;
cout<<"Calling swap"<<endl;
swapp(x,y);
cout<<"x = " << x << endl;
cout<<"y = " << y <<endl;