commit 4b4e000203f5b967cad24d64b550fe94378c9b79
Author: HCL <1028329274@qq.com>
Date:   Fri Aug 7 02:28:05 2020 +0800

    Main.java

diff --git a/Main.java b/Main.java
new file mode 100644
index 0000000..04bb965
--- /dev/null
+++ b/Main.java
@@ -0,0 +1,36 @@
+package N;
+
+import java.util.List;
+import java.util.Scanner;
+
+public class Main {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scan = new Scanner(System.in);
+		int i = scan.nextInt();
+		switch(i) {//选择计算方式
+		case 1://计算e^x
+			A.main(args);
+			break;
+		case 2://计算logax
+			B b = new B();
+			B.main(args);
+			break;
+		case 3://计算加减乘除
+			Scanner scanner=new Scanner(System.in);
+			System.out.println("输入表达式：");
+			String expression=scanner.next();
+			Calculation  calculation=new  Calculation();
+			List<String> rpnList=calculation.InfixtoList(expression);
+			List<String> tr=calculation.ListtoSuffix(rpnList);
+			int res=calculation.calculate(tr);
+			System.out.println(res);
+			break;
+		case 4://计算三角函数
+	    	D.main(args);
+			break;
+		}
+	}
+
+}