Eroare de compilare: user.cpp: In function ‘int xv(char*)’: user.cpp:11: error: ‘strlen’ was not declared in this scope user.cpp: In function ‘int nrf(char*)’: user.cpp:19: error: ‘strtok’ was not declared in this scope user.cpp: In function ‘int intt(char*)’: user.cpp:29: error: ‘strlen’ was not declared in this scope user.cpp: In function ‘float expr(char*)’: user.cpp:36: error: ‘strcpy’ was not declared in this scope user.cpp:41: error: ‘strlen’ was not declared in this scope user.cpp:50: error: ‘strlen’ was not declared in this scope user.cpp:38: warning: unused variable ‘n’