private void openParenthesis() { Symbol sym = new OpenParenthesis(); if (ERROR_MESSAGE.Equals(_equationText) || "0".Equals(_equationText)) { changeEquationText(sym.ToString()); return; } var eq = new Equation(_equationText); if (!eq.HasFinalOperator()) { // Disallow a number followed by an open parenthesis return; } changeEquationText(_equationText + sym.ToString()); }
private void operator operatorButtonClicked(Symbol op) { if (ERROR_MESSAGE.Equals(_equationText)) { changeEquationText("0" + op.ToString()); return; } var eq = new Equation(_equationText); if (eq.HasFinalOperator()) { changeEquationText(eq.ReplaceFinalOperator(op)); } else { changeEquationText(_equationText + op.ToString()); } }
protected void OnButtonDotClicked(object sender, System.EventArgs e) { if (ERROR_MESSAGE.Equals(_equationText)) { changeEquationText("0."); return; } var eq = new Equation(_equationText); if (!eq.HasFinalOperator()) { changeEquationText(_equationText + "."); } }