Removed namespace, added namespace on the function calls

Using namespaces is considered bad practice.

http://stackoverflow.com/a/1453605/1177391

c/c++.cpp

@@ -1,8 +1,6 @@
-#include<iostream>
-
-using namespace std;
+#include <iostream>
 
 int main()
 {
-	cout << "Hello World" << endl;
+	std::cout << "Hello World" << std::endl;
 }