Update ex6_12.cpp

ch06/ex6_12.cpp

@@ -1,4 +1,4 @@
-//!@Alan
+//!@Yue Wang
 //!
 //! Exercise 6.12:
 //! Rewrite the program from exercise 6.10 in § 6.2.1 (p. 210) to use
@@ -8,34 +8,28 @@
 //!
 
 
-
 #include <iostream>
 #include <string>
 #include <stdexcept>
 
-using namespace std;
 
-void swap(int& _n1, int& _n2);
+void swap(int& lhs, int& rhs)
+{
+    int temp = lhs;
+    lhs = rhs;
+    rhs = temp;
+}
 
 int main()
 {
-    int n1, n2;
-
-    cout<<"Please Enter:\n";
-    while(cin>>n1>>n2)
+    int left, right;
+    std::cout << "Please Enter:\n";
+    while (std::cin >> left >> right)
     {
-        swap(n1, n2);
-        cout<<n1<<" "<<n2<<endl;
+        swap(left, right);
+        std::cout << left << " " << right << std::endl;
     }
 
     return 0;
 }
 
-void swap(int &_n1, int &_n2)
-{
-    int temp;
-    temp = _n1;
-    _n1 = _n2;
-    _n2 = temp;
-
-}