/in/foo.c: In function 'pan':
/in/foo.c:12:7: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
 return(p);
       ^
/in/foo.c: In function 'main':
/in/foo.c:21:4: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
 if (pan(m)==0&&pan(n)==0) printf("Shadow\n");
    ^
/in/foo.c:21:14: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
 if (pan(m)==0&&pan(n)==0) printf("Shadow\n");
     ~~~~~~~~~^~~~~~~~~~~