sj.java

cal4.java

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+package calculator;
+
+import java.util.Scanner;
+
+public class cal4 {
+		public cal4() {
+			Scanner inScanner=new Scanner(System.in);
+			System.out.print("请输入第一位运算数：");
+			double a=inScanner.nextInt();
+			System.out.print("请输入第二位运算数：");
+			double b=inScanner.nextInt();
+			System.out.print("请输入将要运算的运算符：");
+			String op=inScanner.next();
+			char ch=op.charAt(0);
+			double sum=cala(a, b, ch);
+			System.out.println("结果为:"+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;
+			}
+		}
+}

ex.java

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+package calculator;
+import java.util.Scanner;
+import java.lang.Math;
+public class ex {
+
+     public ex(){
+    	 
+    	 Scanner input= new Scanner(System.in);
+        
+    		System.out.print("请输入数字x：");
+    		int x=input.nextInt();
+            double e=Math.E;
+            double n=Math.pow(e, x);
+    	
+ 
+    	System.out.printf("结果为%.9f\n",n);
+     }
+}

log.java

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+package calculator;
+import java.util.Scanner;
+public class log {
+	
+		public log() {
+			Scanner sc = new Scanner(System.in);
+			System.out.println("请输入底数a");
+			double a = sc.nextDouble();
+			System.out.println("请输入真数x");
+			double x = sc.nextDouble();
+			if(x>0&&a>0&&a!=1)
+			{
+				double result = log(a,x);
+			    System.out.println("结果为:"+result);
+			}
+			else
+			System.out.println("errors ");
+		}
+
+		public static double log(double a, double x){
+			return Math.log(x) / Math.log(a);
+		}
+}

main.java

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+package calculator;
+import java.util.Scanner;
+public class main {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		
+		System.out.println("选择计算类型\n1、e~x\n2、logax\n3、＋－×÷\n4、三角函数\n0、退出");	
+		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("计算结束");
+}
+
+}

sj.java

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+/*
+ * 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("请输入一个运算（单位为度）:");
+			int a=inScanner.nextInt();
+                        System.out.print("接下来摁1是sin函数，2是cos函数，3是tan函数");
+                        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));
+                            
+                      }
+    }
+}