Compilare: user.c: In function ‘main’: user.c:43: warning: passing argument 1 of ‘printf’ from incompatible pointer type /usr/include/bits/stdio2.h:103: note: expected ‘const char * __restrict__’ but argument is of type ‘struct FILE *’ user.c:40: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result user.c: In function ‘eval’: user.c:33: warning: control reaches end of non-void function user.c: At top level: user.c:5: warning: array ‘s’ assumed to have one element In file included from /usr/include/stdio.h:910, from user.c:1: In function ‘fgets’, inlined from ‘main’ at user.c:40: /usr/include/bits/stdio2.h:253: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer