Mainn.java

@@ -0,0 +1,155 @@
+package test;
+import java.util.Arrays;
+import java.util.Scanner;
+import java.util.*;
+class power{
+
+public static int factorial(int n){
+		int factorial=1;
+		int counter=1;
+		while (counter<1+n){
+			factorial*=counter+1;
+			counter++;
+		}
+		return factorial;
+	}	
+public static double ex(int n,int x){
+	double ex=1.0;
+	int counter=1;
+	while (counter<=n){
+		ex+=(double)Math.pow(x,counter)/factorial(counter);
+		counter++;
+	}
+	return ex;
+}	
+
+
+
+}
+
+class b {
+    public static void main(String[] args) {
+    	int a;
+    	int x;
+    	double result;
+    	System.out.println("输入底数a(a>0且a！=1):");
+    	Scanner sc = new Scanner(System.in);
+    	a=sc.nextInt();		
+    	System.out.println("输入真数x:");
+    	x=sc.nextInt();		
+        result = log(x, a);
+        System.out.println(result);
+    }
+ 
+    public static double log(double value, double base) {
+        return Math.log10(value) / Math.log10(base);
+    }
+}
+class CALC{
+	public static void main(String args[]){
+		double x;
+		double y;
+		String z;
+		Scanner sc=new Scanner(System.in);
+		System.out.println("输入第一个数：");
+		x=sc.nextDouble();
+		System.out.println("输入运算符：");
+		z=sc.next();
+		System.out.println("输入第二个数：");
+		y=sc.nextDouble();
+		System.out.print("结果是：");
+		switch(z){
+		case"+":System.out.println(x+y);
+			break;
+		case"-":System.out.println(x-y);
+			break;
+		case"*":System.out.println(x*y);
+			break;
+		case"/":System.out.println(x/y);
+			break;
+		}
+	}
+}
+
+class d {
+	String s;
+	double x;
+	public d(String s,double x)
+	{
+		this.s=s;
+		this.x=x;
+	}
+	public  double sanjiao()
+	{
+		if (s.equals("sin")) return sin(x);
+		else if (s.equals("cos")) return cos(x);
+		else if (s.equals("tan")) return tan(x);
+		else if (s.equals("asin")) return asin(x);
+		else if (s.equals("acos")) return acos(x);
+		else if (s.equals("atan")) return atan(x);
+		else return Double.POSITIVE_INFINITY;
+	}
+	private double sin(double x) {return Math.sin(x);}
+	private double cos(double x) {return Math.cos(x);}
+	private double tan(double x) {return Math.tan(x);}
+	private double asin(double x) {return Math.asin(x);}
+	private double acos(double x) {return Math.acos(x);}
+	private double atan(double x) {return Math.atan(x);}
+}
+public class Main {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner s=new Scanner(System.in);
+		System.out.println("1 for e^x\n2 for logax\n3 for +-*/\n4 for 三角函数");
+		int calnum=s.nextInt();//选择数字决定进行哪种运算
+		if(calnum ==1){
+			System.out.println("type x:");
+			Scanner x=new Scanner(System.in);
+			System.out.println("result:"+power.ex(1, x.nextInt()));
+		}
+		if(calnum==2) {
+			int a,x;
+			System.out.println("type a:");
+			Scanner sc=new Scanner(System.in);
+			a=sc.nextInt();
+			System.out.println("type x:");
+			x=sc.nextInt();
+			System.out.println("result:"+b.log(x,a));
+		}
+		if(calnum==3) {
+			double x;
+			double y;
+			String z;
+			Scanner sc=new Scanner(System.in);
+			System.out.println("type the first number：");
+			x=sc.nextDouble();
+			System.out.println("type calculation symbol：");
+			z=sc.next();
+			System.out.println("type the second number：");
+			y=sc.nextDouble();
+			System.out.print("result：");
+			switch(z){
+			case"+":System.out.println(x+y);
+				break;
+			case"-":System.out.println(x-y);
+				break;
+			case"*":System.out.println(x*y);
+				break;
+			case"/":System.out.println(x/y);
+				break;
+		}
+	}
+		if(calnum==4) {
+			System.out.println("choose sin,cos,tan,asin,acos or atan");
+			String ss;double x;
+			Scanner sc=new Scanner(System.in);
+			ss=sc.nextLine();
+			System.out.print("type x:");
+			x=sc.nextDouble();
+			d ch=new d(ss,x);
+			System.out.print("result："+ch.sanjiao());
+		}
+		}
+
+}

a.java

@@ -0,0 +1,25 @@
+package eµÄx´Î·½;
+public class power{
+
+public static int factorial(int n){
+		int factorial=1;
+		int counter=1;
+		while (counter<1+n){
+			factorial*=counter+1;
+			counter++;
+		}
+		return factorial;
+	}	
+public static double ex(int n,int x){
+	double ex=1.0;
+	int counter=1;
+	while (counter<=n){
+		ex+=(double)Math.pow(x,counter)/factorial(counter);
+		counter++;
+	}
+	return ex;
+}	
+
+
+
+}

c.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+public class CALC{
+	public static void main(String args[]){
+		double x;
+		double y;
+		String z;
+		Scanner sc=new Scanner(System.in)
+		System.out.println("输入第一个数：");
+		x=sc.nextDouble();
+		System.out.println("输入运算符：");
+		z=sc.next();
+		System.out.println("输入第二个数：");
+		y=sc.nextDouble();
+		System.out.print("结果是：");
+		switch(z){
+		case"+":System.out.println(x+y);
+			break;
+		case"-":System.out.println(x-y);
+			break;
+		case"*":System.out.println(x*y);
+			break;
+		case"/":System.out.println(x/y);
+			break;
+		}
+	}
+}

d.java

@@ -0,0 +1,27 @@
+package ¼Ó¼õ³Ë³ý;
+import java.util.*;
+public class d {
+	String s;
+	double x;
+	public d(String s,double x)
+	{
+		this.s=s;
+		this.x=x;
+	}
+	public double sanjiao()
+	{
+		if (s.equals("sin")) return sin(x);
+		else if (s.equals("cos")) return cos(x);
+		else if (s.equals("tan")) return tan(x);
+		else if (s.equals("asin")) return asin(x);
+		else if (s.equals("acos")) return acos(x);
+		else if (s.equals("atan")) return atan(x);
+		else return Double.POSITIVE_INFINITY;
+	}
+	private double sin(double x) {return Math.sin(x);}
+	private double cos(double x) {return Math.cos(x);}
+	private double tan(double x) {return Math.tan(x);}
+	private double asin(double x) {return Math.asin(x);}
+	private double acos(double x) {return Math.acos(x);}
+	private double atan(double x) {return Math.atan(x);}
+}