Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:4: error: expected initializer before ‘sol’ user.cpp:8: error: ‘b’ was not declared in this scope user.cpp:9: error: ‘x’ was not declared in this scope user.cpp:12: error: ‘sol’ was not declared in this scope user.cpp:14: error: ‘sol’ was not declared in this scope user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result