Calculator.java

Calculator.java

@@ -7,7 +7,7 @@ public class Calculator {
     {
         Scanner sc=new Scanner(System.in);
         double result=1.0;
-        System.out.println("对数 0;sin 6;cos 7;tan 8;e的指数 1； ");
+        System.out.println("对数 0;sin 6;cos 7;tan 8;e的指数 1；加 2；减 3；乘 4；除 5 ");
         String Command=sc.nextLine();
         System.out.println("输入对应运算数值 两数以空格间隔");
         String parameters=sc.nextLine();
@@ -19,8 +19,43 @@ public class Calculator {
               ExFunction e = new ExFunction(Double.parseDouble(parameters));
               result=e.index();
           }
-//        else if(Command.equals("2"))
-//            result=Calculator.jjcc(parameters);
+          else if(Command.equals("2"))
+            {
+              String[] s=new String[2];
+             s=parameters.split(" ");
+             double a=Double.parseDouble(s[0]);
+             double b=Double.parseDouble(s[1]);
+              jjcc e = new jjcc();
+              result = e.add(a,b);
+          }
+          else if(Command.equals("3"))
+             {
+              String[] s=new String[2];
+             s=parameters.split(" ");
+             double a=Double.parseDouble(s[0]);
+             double b=Double.parseDouble(s[1]);
+              jjcc e = new jjcc();
+              result = e.sub(a,b);
+          } 
+          else if(Command.equals("4"))
+                  {
+              String[] s=new String[2];
+             s=parameters.split(" ");
+             double a=Double.parseDouble(s[0]);
+             double b=Double.parseDouble(s[1]);
+              jjcc e = new jjcc();
+              result = e.mul(a,b);
+          }
+          else if(Command.equals("5"))
+          {
+              String[] s=new String[2];
+             s=parameters.split(" ");
+             double a=Double.parseDouble(s[0]);
+             double b=Double.parseDouble(s[1]);
+              jjcc e = new jjcc();
+              result = e.div(a,b);
+          }
+        
           else if(Command.equals("6"))
         	  result=Calculator.sin(parameters);
           else if(Command.equals("7"))
@@ -75,4 +110,28 @@ public class Calculator {
             return Math.exp(x);
         }
 
-}
+}
+ class jjcc {
+    
+    public double x;
+
+        public jjcc() {
+            
+        }
+    public  double add(double a,double b)
+    {
+        return a+b;
+    }
+    public static double sub(double a,double b)
+    {
+        return a-b;
+    }
+    public static double mul(double a,double b)
+    {
+        return a*b;
+    }
+    public static double div(double a,double b)
+    {
+        return (double)a/b;
+    }
+}