学习attribute的时候遇到的，感觉可能会用到，记录一下，注意前后都是两个下划线。而且这些宏都是编译器内置好的，不用特意用头文件包含，示例用的test.c

  • FILE

    1

    printf("The file is %s.\n",__FILE__);//The file is test.c.

  • DATE

    1

    printf("The date is %s.\n", __DATE__);//The date is Dec 17 2019.

  • LINE

    1

    printf("This is line %d.\n", __LINE__);//This is line 8.

  • TIME

    1

    printf("The time is %s.\n", __TIME__);//The time is 13:15:47.

  • FUNCTION

    1

    printf("This function is %s.\n", __FUNCTION__);//This function is main.