Compilare: main.cpp: In function 'void sub(int*, int*, int*)': main.cpp:22:24: warning: 'sizeof' on array function parameter 'C' will return size of 'int*' [-Wsizeof-array-argument] memset(C,0,sizeof(C)); ^ main.cpp:20:33: note: declared here void sub(int A[], int B[],int C[]) ^ main.cpp:22:22: warning: argument to 'sizeof' in 'void* memset(void*, int, size_t)' call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset(C,0,sizeof(C)); ^