Compilare: user.c: In function ‘main’: user.c:20: warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘char *’ user.c:20: warning: format ‘%d’ expects type ‘int *’, but argument 3 has type ‘char *’ user.c:18: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:19: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:20: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:21: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result