我试着从 C Primer Plus 运行一个示例：

Listing 2.1 The first.c Program
#+BEGIN_SRC C :results output
#include <stdio.h>
int main(void)                /* a simple program             */
{
    int num;                  /* define a variable called num */
    num = 1;                  /* assign a value to num        */

    printf("I am a simple "); /* use the printf() function    */
    printf("computer.n");
    printf("My favorite number is %d because it is first.n",num);

    return 0;
}
#+END_SRC

它报告神秘错误为：

/tmp/babel-xEtnj6/C-src-mefAEj.c:9:15: error: stray ‘\302’ in program
    9 | int main(void)                /* a simple program             */
      |               ^
/tmp/babel-xEtnj6/C-src-mefAEj.c:9:16: error: stray ‘\240’ in program
    9 | int main(void)                /* a simple program             */
      |                ^
/tmp/babel-xEtnj6/C-src-mefAEj.c:9:17: error: stray ‘\302’ in program
    9 | int main(void)                /* a simple program             */

如果删除了main()，它可以工作：

#+BEGIN_SRC C
printf("Literature Programming");
#+END_SRC

#+RESULTS:
: Literature Programming

不幸的是，大多数C代码都封装在'main'中。
我怎样才能让第一个例子工作呢？