Eroare de compilare: user.cpp:2:16: error: stdio: No such file or directory user.cpp:3: error: ‘usingnamespace’ does not name a type user.cpp:4: error: ‘fopen’ was not declared in this scope user.cpp:5: error: ‘fopen’ was not declared in this scope user.cpp:34: error: ‘::main’ must return ‘int’ user.cpp: In function ‘int main()’: user.cpp:36: error: ‘fscanf’ was not declared in this scope user.cpp:69: error: ‘fprintf’ was not declared in this scope user.cpp:77: error: ‘fclose’ was not declared in this scope