package Internship;

public class jjcc {
	 static void sum(double a, double b) {
		double resum=a+b;
		System.out.println(a+"+"+b+"="+resum);
	}
	static void subtraction(double a,double b) {
		double resub=a-b;
		System.out.println(a+"-"+b+"="+resub);
	}
	static void mul(double a,double b) {
		double remul=a*b;
		System.out.println(a+"*"+b+"="+remul);
	}
	static void division(double a,double b) {
		double redivision=0;
		if(b!=0) {
			redivision=a/b;
		}
		else {
			redivision=0;   /*表示错误*/
		}
		System.out.println(a+"÷"+b+"="+redivision);
	}

}


package Internship;

public class ex {
	static void e(int x) {
		double e=Math.E;
        double result;
        
        result=Math.pow(e,x);
        System.out.println("result="+result);
       	
    }
}


package Internship;


public class logax {
	static void log(int a, int x) {
		System.out.println("log"+a+" "+x+" = "+(Math.log(x)/Math.log(a)));
	}
	
}


package Internship;

public class Trigonometric_Functions {
	public Trigonometric_Functions(String chose,double Value) {
		double a = Math.toRadians(Value);
		switch(chose) {
		    case "sin":
		    	System.out.println(String.format("%.2f",Math.sin(a)));
		    	break;
		    case "cos":
		    	System.out.println(String.format("%.2f",Math.cos(a)));
		    	break;
		    case "tan":
		    	System.out.println(String.format("%.2f",Math.tan(a)));
		    	break;
		}
	}
}


package Internship;

import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		int a, b;
		Scanner sc = new Scanner(System.in);
		
		System.out.println("输入a的值:");
		a = sc.nextInt();
		System.out.println("输入b的值:");
		b = sc.nextInt();
		
		System.out.println("加减乘除运算:");
		jjcc.sum(a, b);
		jjcc.subtraction(a, b);
		jjcc.mul(a, b);
		jjcc.division(a, b);
		System.out.println();
		
		System.out.println("e的x次方运算:");
		ex.e(a);
		System.out.println();
		
		System.out.println("logax运算:");
		logax.log(a, b);
		System.out.println();
		
		System.out.println("三角函数运算:");
		Trigonometric_Functions tf1 = new Trigonometric_Functions("sin", 30);
		Trigonometric_Functions tf2 = new Trigonometric_Functions("cos", 30);
		Trigonometric_Functions tf3 = new Trigonometric_Functions("tan", 30);
	}
}