Originally Posted by fzafarani

Hi guys,
i have one question, when i type
using namespace std;
at top of my program my compiler gives some error
especially syntax error!
my compiler is Borland C++ v.5
for example simple code:

Originally Posted by twomers

Shouldn't use void main. getch() isn't a great way of stopping the program. iostream.h is non-standard. use iostream:

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C++ Syntax (Toggle Plain Text)

#include <iostream>
 
using namespace std;
 
int main( void ) {
 
  std::cin.ignore();
  return 0;
}

#include <iostream> using namespace std; int main( void ) { std::cin.ignore(); return 0; }

Originally Posted by Ancient Dragon

When using the old headers with .h extension you don't use "using namespace std". Check to see if your compiler supports the new headers without an extension and use those instead. The old files are out-of-date and will cause lots of other problems if you attempt to use current coding practices.

The use of namespace std for all identifiers of the C++ standard library was introduced during
the standardization process. This change is not backward compatible to old header files, in which identifiers of the C++ standard library are declared in the global scope.
In addition, some interfaces of classes changed during the standardization process (however, the goal was to stay backward compatible if possible). So, a new style for the names of standard header files was introduced. This allows vendors to stay backward compatible by providing the old header files.