Compilare: user.cpp: In member function ‘int ExpressionSolver::termen()’: user.cpp:61:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( point < expression.size() && isdigit( expression[ point ] ) ) ^ user.cpp: In member function ‘int ExpressionSolver::evaluate(int)’: user.cpp:88:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( point < expression.size() && strchr( op[level], expression[ point ] ) ) ^ user.cpp: In member function ‘int ExpressionSolver::operation(int, int, char)’: user.cpp:47:9: warning: control reaches end of non-void function [-Wreturn-type] } ^