Calculator.java

Calculator.java

@@ -0,0 +1,78 @@
+package cal;
+import java.util.Scanner;
+import java.math.*;
+
+public class Calculator {
+    public static void main(String[] args) 
+    {
+        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； ");
+        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();
+        if(Command.equals("0"))
+            result=Calculator.Log(parameters);
+          else if(Command.equals("1"))
+          {
+              //double x=Double.parseDouble(parameters);
+              ExFunction e = new ExFunction(Double.parseDouble(parameters));
+              result=e.index();
+          }
+//        else if(Command.equals("2"))
+//            result=Calculator.jjcc(parameters);
+          else if(Command.equals("6"))
+        	  result=Calculator.sin(parameters);
+          else if(Command.equals("7"))
+        	  result=Calculator.cos(parameters);
+          else if(Command.equals("8"))
+        	  result=Calculator.tan(parameters);
+        System.out.println(result);
+        
+    }
+    public static double Log(String s)
+    {
+        String[] parameters=new String[2];
+        parameters=s.split(" ");
+        float a=Float.parseFloat(parameters[0]);
+        float b=Float.parseFloat(parameters[1]);
+        double result=Math.log(b)/Math.log(a);  
+        return result;
+    }
+    public static double sin(String s)
+    {
+       double x=Double.parseDouble(s);
+       return Math.sin(Math.toRadians(x));//Math.toRadians()将角度转换为弧度	   
+    }
+    public static double cos(String s)
+    {
+    	double x=Double.parseDouble(s); 
+        return Math.cos(Math.toRadians(x));
+    }
+    public static double tan(String s)
+    {
+    	double x=Double.parseDouble(s); 
+    	return Math.tan(Math.toRadians(x));
+    }
+    
+//    public static double jjcc()
+//    {
+//        
+//    }
+//    public static double ex()
+//    {
+//        
+//    }
+}
+    class ExFunction {
+        public double x;
+
+        public ExFunction(double x) {
+            this.x = x;
+        }
+
+        public double index() {
+            return Math.exp(x);
+        }
+
+}