Compilare: user.c: In function ‘main’: user.c:16: warning: passing argument 2 of ‘freopen’ makes pointer from integer without a cast /usr/include/stdio.h:255: note: expected ‘const char * __restrict__’ but argument is of type ‘int’ user.c:17: warning: passing argument 2 of ‘freopen’ makes pointer from integer without a cast /usr/include/stdio.h:255: note: expected ‘const char * __restrict__’ but argument is of type ‘int’ user.c:27: warning: suggest parentheses around comparison in operand of ‘&’ user.c:16: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:17: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:19: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result