senzori.cpp: In function `int main()': senzori.cpp:6: `citire' undeclared (first use this function) senzori.cpp:6: (Each undeclared identifier is reported only once for each function it appears in.) senzori.cpp:7: `afisare' undeclared (first use this function) senzori.cpp:8: `scriere' undeclared (first use this function)