Compilare: user.c: In function ‘main’: user.c:83:5: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(aib, 0, sizeof aib); ^ user.c:83:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c: In function ‘readch’: user.c:18:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, BUFF, in); ^