Compilare: user.c: In function ‘main’: user.c:9: warning: passing argument 1 of ‘scanf’ from incompatible pointer type /usr/include/stdio.h:428: note: expected ‘const char * __restrict__’ but argument is of type ‘struct FILE *’ user.c:22: 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:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:6: warning: ‘c’ may be used uninitialized in this function