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