/in/foo.c: In function 'main':
/in/foo.c:15:22: warning: unused variable 'num' [-Wunused-variable]
   15 |                  int num=insert[i];
      |                      ^~~
/in/foo.c:17:27: error: 'num' undeclared (first use in this function)
   17 |         for(j=0;j<n&&a[j]<num;j++)
      |                           ^~~
/in/foo.c:17:27: note: each undeclared identifier is reported only once for each function it appears in