Compilare: user.c:21: warning: return type of ‘main’ is not ‘int’ user.c: In function ‘main’: user.c:29: warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘char *’ user.c:32: warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘char *’ user.c:22: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:23: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:25: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:29: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:32: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result