KB104672 - You receive compiler errors when you compile a file that includes a C++ header file in a C program

MORE INFORMATION

The C/C++ compiler invokes either the C compiler or the C++ compiler according to the file's extension. If it ends in .C, the C compiler is invoked; if it ends in .CPP or .CXX, the C++ compiler is invoked.

To invoke the C++ compiler on a file that ends in .C or some other extension, use the /Tp switch to explicitly specify a C++ source file.

The sample code below produces the errors

error C2065: 'cout' : undeclared identifier
error C2297: '<<' : illegal, right operand has type 'char [12]'

if compiled with:

   cl hello.c

The code compiles fine if compiled with:

   cl hello.cpp

-or-

   cl /Tp hello.c

Sample Code

/* Compile options needed:  None
*/ 

#include <iostream.h>

void main (void)
{
     cout << "Hello World";
}

You receive compiler errors when you compile a file that includes a C++ header file in a C program

SUMMARY

MORE INFORMATION

Sample Code