Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:8: error: ‘fopen’ was not declared in this scope user.cpp:9: error: ‘printf’ was not declared in this scope user.cpp:12: error: ‘fscanf’ was not declared in this scope user.cpp:14: error: ‘calloc’ was not declared in this scope user.cpp:38: error: ‘fprintf’ was not declared in this scope user.cpp:39: error: ‘fprintf’ was not declared in this scope user.cpp:41: error: ‘fclose’ was not declared in this scope