Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:6: error: ‘d’ was not declared in this scope user.cpp:6: error: ‘b1’ was not declared in this scope user.cpp:6: error: ‘g’ was not declared in this scope user.cpp:6: error: ‘b2’ was not declared in this scope user.cpp:6: error: ‘f’ was not declared in this scope user.cpp:7: error: ‘sol’ was not declared in this scope user.cpp:8: error: ‘r’ was not declared in this scope user.cpp:4: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:5: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result