General FORM of #line preprocessor is #line NUMBER "filename"

Here the file name is optional. Filename string replaces the string value of _ _FILE_ _ while the number changes the value of _ _LINE_ _.

The major use of #line is in DEBUGGING and rare programming situation.

Following C SOURCE code shows the #line preprocessor in action -

#include 
int main ()
{
printf ("n%d", __LINE__); //Prints 6
#line 100;
printf ("n%d",__LINE__); // Prints 101
printf ("n%d", __FILE__);// Prints original source file name
#line 103 "Super C"
printf ("n%d", __FILE__); //Prints Super C
return 0;
}

General form of #line preprocessor is #line number "filename"

Here the file name is optional. Filename string replaces the string value of _ _FILE_ _ while the number changes the value of _ _LINE_ _.

The major use of #line is in debugging and rare programming situation.

Following C Source code shows the #line preprocessor in action -

#include 
int main ()
{
printf ("n%d", __LINE__); //Prints 6
#line 100;
printf ("n%d",__LINE__); // Prints 101
printf ("n%d", __FILE__);// Prints original source file name
#line 103 "Super C"
printf ("n%d", __FILE__); //Prints Super C
return 0;
}