Compilare: user.cpp: In function ‘void init()’: user.cpp:19:36: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(c3,NULL,strlen(c3)+1); ^ user.cpp: In function ‘int main()’: user.cpp:68:56: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(csol,NULL,strlen(csol)+1); ^ user.cpp:115:58: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(csolb,NULL,strlen(csolb)+1); ^ user.cpp:118:34: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] csolb[La]=NULL; ^