Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:14:15: error: ‘strlen’ was not declared in this scope n=strlen(a); ^ user.cpp:19:17: error: ‘strcpy’ was not declared in this scope strcpy(aux,a); ^ user.cpp:20:15: error: ‘strrev’ was not declared in this scope strrev(aux); ^ user.cpp:21:20: error: ‘strcmp’ was not declared in this scope if(strcmp(a,aux)==0) ^