commit 935729e34e368a0e4382762433bf51b1341d2569
Author: 黄东海 <2544468477@qq.com>
Date:   Thu Aug 6 18:40:16 2020 +0800

    sj.java

diff --git a/cal4.java b/cal4.java
new file mode 100644
index 0000000..dd7d00e
--- /dev/null
+++ b/cal4.java
@@ -0,0 +1,31 @@
+package calculator;
+
+import java.util.Scanner;
+
+public class cal4 {
+		public cal4() {
+			Scanner inScanner=new Scanner(System.in);
+			System.out.print("ÇëÊäÈëµÚһλÔËËãÊý£º");
+			double a=inScanner.nextInt();
+			System.out.print("ÇëÊäÈëµÚ¶þλÔËËãÊý£º");
+			double b=inScanner.nextInt();
+			System.out.print("ÇëÊäÈ뽫ҪÔËËãµÄÔËËã·û£º");
+			String op=inScanner.next();
+			char ch=op.charAt(0);
+			double sum=cala(a, b, ch);
+			System.out.println("½á¹ûΪ:"+sum);
+		}
+		
+		public static double cala(double x,double y,char op) {
+			switch (op) {
+			case '+': return x+y;
+			case '-': return x-y;
+			case '*': return x*y;
+			case '/': 
+				if(y==0) return 0;
+				else return x/y;
+			default:
+				return x;
+			}
+		}
+}
\ No newline at end of file
diff --git a/ex.java b/ex.java
new file mode 100644
index 0000000..e85763a
--- /dev/null
+++ b/ex.java
@@ -0,0 +1,18 @@
+package calculator;
+import java.util.Scanner;
+import java.lang.Math;
+public class ex {
+
+     public ex(){
+    	 
+    	 Scanner input= new Scanner(System.in);
+        
+    		System.out.print("ÇëÊäÈëÊý×Öx£º");
+    		int x=input.nextInt();
+            double e=Math.E;
+            double n=Math.pow(e, x);
+    	
+ 
+    	System.out.printf("½á¹ûΪ%.9f\n",n);
+     }
+}
diff --git a/log.java b/log.java
new file mode 100644
index 0000000..c9c613b
--- /dev/null
+++ b/log.java
@@ -0,0 +1,23 @@
+package calculator;
+import java.util.Scanner;
+public class log {
+	
+		public log() {
+			Scanner sc = new Scanner(System.in);
+			System.out.println("ÇëÊäÈëµ×Êýa");
+			double a = sc.nextDouble();
+			System.out.println("ÇëÊäÈëÕæÊýx");
+			double x = sc.nextDouble();
+			if(x>0&&a>0&&a!=1)
+			{
+				double result = log(a,x);
+			    System.out.println("½á¹ûΪ:"+result);
+			}
+			else
+			System.out.println("errors ");
+		}
+
+		public static double log(double a, double x){
+			return Math.log(x) / Math.log(a);
+		}
+}
diff --git a/main.java b/main.java
new file mode 100644
index 0000000..49f1dd0
--- /dev/null
+++ b/main.java
@@ -0,0 +1,39 @@
+package calculator;
+import java.util.Scanner;
+public class main {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		
+		System.out.println("Ñ¡Ôñ¼ÆËãÀàÐÍ\n1¡¢e~x\n2¡¢logax\n3¡¢£«£­¡Á¡Â\n4¡¢Èý½Çº¯Êý\n0¡¢Í˳ö");	
+		Scanner inScanner = new Scanner(System.in);
+          
+          int flag=1;
+     while(flag==1)
+     {
+          int op1=inScanner.nextInt();
+          switch(op1) {
+          case 1: 
+        	  ex ex=new ex();
+        	  break;
+          
+		  case 2: 
+			  log log=new log();
+			  break;
+		 
+		  case 3: 
+			  cal4 cal=new cal4(); 
+			  break;
+		  
+		  case 4: 
+			  sj sj=new sj();
+		      break;
+		  
+		  case 0: flag=0; 
+          }
+	}
+     System.out.println("¼ÆËã½áÊø");
+}
+
+}
diff --git a/sj.java b/sj.java
new file mode 100644
index 0000000..72458da
--- /dev/null
+++ b/sj.java
@@ -0,0 +1,32 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package calculator;
+
+import java.util.*;
+public class sj {
+
+    
+    public sj() {
+       Scanner inScanner=new Scanner(System.in);
+			System.out.print("ÇëÊäÈëÒ»¸öÔËË㣨µ¥Î»Îª¶È£©:");
+			int a=inScanner.nextInt();
+                        System.out.print("½ÓÏÂÀ´Þô1ÊÇsinº¯Êý£¬2ÊÇcosº¯Êý£¬3ÊÇtanº¯Êý");
+                        int y=inScanner.nextInt();
+                      if(y==1){
+			double x = Math.toRadians(a);
+			System.out.println(Math.sin(x));
+                      }
+                      if(y==2) {
+                          double b = Math.toRadians(a);
+                        System.out.println(Math.cos(b));
+                      }
+                       if(y==3){
+		        double c = Math.toRadians(a);
+                        System.out.println(Math.tan(c));
+                            
+                      }
+    }
+}
\ No newline at end of file