C Tutorial/Preprocessor/line

#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.

<source lang="cpp">#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");

}</source>

A
      B
      C FILE line0.c LINE 101
      D
      E