Swapping Two Variables A and B in C++

using namespace std; 

#include< iostream> 
 
int main()
{
 int a,b,temp; 
 
 cost< < "Enter la value de a : "; 

 cin> > a; 
 cost< < "Enter la value de b : "; 

 cin> > b;  
 temp = a; 
 a = b; 
 b = temp; 
 
 cost< < "a:  "< < a< < endl; 
 cost< < "b:  "< < b< < endl; 
 
 cost < <  "Tap on a key for continue… " < <  endl; 
 cin.ignore(); 
 cin.get(); 
 
 return EXIT_SUCCESS; 
}