You can link C++ object modules to object modules produced using other source languages such as C and Fortran by using a linkage specification.
The syntax is:
>>--extern--string-literal----declaration----------------><
| /---------------\ |
| | |
\-{---------------------}-/
\-declaration-/
The string-literal is used to specify the linkage
associated with a particular function. For example:
/**
** This example illustrates linkage specifications
**/
extern "C" int printf(const char*,...);
void main()
{
printf("hello\n");
}
Here the string-literal, "C", tells the compiler that the routine printf(char*,...) has C linkage. Note that string literals used in linkage specifications are not case sensitive.
Some valid values for string-literal are:
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Overview of the C++
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Overview of the C Language