update

DSBookCode/BookCode/第3章/3.22/3.22.cpp

@@ -0,0 +1,29 @@
+#include"3.22.h"
+
+int menu() {
+	int c;
+	cout << "0-9以内的多项式计算" << endl;
+	cout << "1.计算" << endl;
+	cout << "0.退出\n" << endl;
+	cout << "选择：";
+	cin >> c;
+	return c;
+}
+
+void main() {
+	while (1) {
+		switch (menu()) {
+		case 1: {
+			cout << "请输入要计算的表达式（操作数和结果都在0-9的范围内，以#结束）：" << endl;
+			char res = EvaluateExpression();//算法3.22　表达式求值
+			cout << "计算结果为" << res - 48 << endl << endl;
+		}
+			break;
+		case 0:
+			cout << "退出成功\n" << endl;
+			exit(0);
+		default:
+			break;
+		}
+	}
+}