teatru.c: In function ‘main’: teatru.c:65: warning: implicit declaration of function ‘memset’ teatru.c:65: warning: incompatible implicit declaration of built-in function ‘memset’ teatru.c:58: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result teatru.c:59: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result teatru.c:61: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result