java学习第37天2020/8/11

import java.util.Scanner;
public class chong {
	public static void main(String []args)
	{
		Scanner input=new Scanner(System.in);
		System.out.println("请输入要比较几个数的最大值：");
		int m=input.nextInt();
		
		switch(m)
		{
		 case 2:int a=input.nextInt();int b=input.nextInt();System.out.println("最大值为：");System.out.println(max(a,b));break;
		 case 3:int c=input.nextInt();int d=input.nextInt();int e=input.nextInt();System.out.println("最大值为：");System.out.println(max(c,d,e));break;
		 case 4:int q=input.nextInt();int w=input.nextInt();int r=input.nextInt();int t=input.nextInt();System.out.println("最大值为：");System.out.println(max(q,w,r,t));break;
		}
	}
    public static int max(int a,int b)
    {
    	if(a>b)
    	{
    		return a;
    	}
    	else {
    		return b;
    	}
    }
    public static int max(int a,int b,int c)
    {
    	int n=max(a,b);
    	if(n>c)
    	{
    		return n;
    	}
    	else {
    		return c;
    	}
    }
    public static int max(int a,int b,int c,int d)
    {

    	int n=max(a,b,c);
    	if(n>d)
    	{
    		return n;
    	}
    	else {
    		return d;
    	}
    }
}

 

 

 

import java.util.Scanner;
public class addd {
	public static void main(String []args) {
		Scanner input=new Scanner(System.in);
		System.out.println("整形输入1，长整型输入2，浮点型输入3，双精度输入4\n");
		int m=input.nextInt();
		switch(m)
		{
		case 1:int a=input.nextInt();int b=input.nextInt();add(a,b);
		case 2:long c=input.nextLong();long d=input.nextLong();add(c,d);
		case 3:float e=input.nextFloat();float f=input.nextFloat();add(e,f);
		case 4:double q=input.nextDouble();double p=input.nextDouble();add(q,p);
		}
	}
    public static void add(int a,int b)
    {
    	int n=a+b;
    	System.out.println("和为"+n);
    }
    public static void  add(long a,long b)
    {
    	long n=a+b;
    	System.out.println("和为"+n);
    }
    public static void add(float a,float b)
    {
    	float n=a+b;
    	System.out.println("和为"+n);
    }
    public static void add(double a,double b)
    {
    	double n=a+b;
    	System.out.println("和为"+n);
    }
}

 

 

 

二.主函数是static函数也是static

三.例题