Compilare: user.cpp: In function ‘int main()’: user.cpp:23:28: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to provide an explicit length? [-Wsizeof-pointer-memaccess] memset(c+1,0,sizeof(c+1)); ^ user.cpp:25:29: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to provide an explicit length? [-Wsizeof-pointer-memaccess] memset(c1+1,0,sizeof(c1+1)); ^ user.cpp:27:15: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>>c+1; ~^~ user.cpp:33:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[c[i]]++; ^