Compilare: user.c:4: warning: data definition has no type or storage class user.c:4: warning: type defaults to ‘int’ in declaration of ‘x’ user.c: In function ‘main’: user.c:52: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘char (*)[100]’ user.c:31: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:32: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:33: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:52: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result