Eroare de compilare: user.c: In function 'mul': user.c:16: warning: implicit declaration of function 'memset' user.c:16: warning: incompatible implicit declaration of built-in function 'memset' user.c:23: warning: implicit declaration of function 'memcpy' user.c:23: warning: incompatible implicit declaration of built-in function 'memcpy' user.c: At top level: user.c:26: error: conflicting types for 'div' /usr/include/stdlib.h:706: error: previous declaration of 'div' was here user.c: In function 'read_data': user.c:35: error: expected expression before ']' token user.c: In function 'write_data': user.c:42: error: expected expression before ']' token user.c:42: error: invalid use of void expression user.c:42: error: invalid use of void expression user.c:42: error: expected expression before ']' token user.c:42: error: invalid use of void expression user.c:42: error: invalid use of void expression user.c:42: error: invalid use of void expression user.c:42: error: invalid use of void expression user.c:42: error: invalid use of void expression user.c:42: error: expected ')' before ';' token user.c:44: error: invalid use of void expression user.c:44: error: expected ';' before '}' token