foo.c: In function 'cmp':
foo.c:12:17: error: 'sol' undeclared (first use in this function)
foo.c:12:17: note: each undeclared identifier is reported only once for each function it appears in
foo.c:12:22: error: expected expression before ')' token
foo.c:13:22: error: expected expression before ')' token
foo.c: In function 'comp':
foo.c:20:17: error: 'sol' undeclared (first use in this function)
foo.c:20:22: error: expected expression before ')' token
foo.c:21:22: error: expected expression before ')' token