C Tutorial/Preprocessor/line

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#line

Define arbitrary line numbers for the source lines.

Using the #line directive, you can specify an arbitrary line number at any point.

The compiler then uses that line number for subsequent counts.


#include <stdio.h>
main()
{
    printf("A\n");
     #line 100
    printf("B\n");
    printf("C FILE %s LINE %d\n", __FILE__, __LINE__ );
     #line 200
    printf("D\n");
    printf("E\n");
}
A
      B
      C FILE line0.c LINE 101
      D
      E