/in/foo.c: In function 'main':
/in/foo.c:12:39: error: 'num' undeclared (first use in this function); did you mean 'sum'?
   12 |                         printf("%d\n",num);}
      |                                       ^~~
      |                                       sum
/in/foo.c:12:39: note: each undeclared identifier is reported only once for each function it appears in