C-#line和#error_C/C++_编程开发_程序员俱乐部

1、

1)源代码：

test2.c

#line 1
int main(void){
printf("line 1\n");
printf("line 2\n");
printf("line 3\n");
printf("line 4\n");
printf("line 5\n");
printf("line 6\n");
printf("line 7\n");
printf("line 8\n");
#include "test1.c

?test1.c

?

#line 9 "test2.c"
#define LINUX
#ifdef WIN32
  printf("win32\n");   
#elif defined LINUX
  printf("linux %d %s\n",__LINE__,__FILE__);        
#else
  #error no flag define 
  //如果LINUX和WIN32没有定义，#error会显示错误信息，然后停止编译
#endif
}

??2）运行结果:

mysea@mysea-pc:~/test$ ./test2

line 1

line 2

line 3

line 4

line 5

line 6

line 7

line 8

linux 13 test2.c