Compilare: user.c: In function ‘filip_main’: user.c:14: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:15: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:22: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:26: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c: In function ‘adunare_main’: user.c:60: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:61: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:64: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c: In function ‘cmmdc_main’: user.c:79: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:80: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:82: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result