Java入门-运算符和表达式

第1关：算数运算符

package step1;
import java.util.Scanner;

public class Cal {
	public static void main(String[] args) {
		/*********start*********/
		 Scanner scanner = new Scanner(System.in);
		 int a,b;
        System.out.println("请输入第一个整数");
       a = scanner.nextInt();
        System.out.println("请输入第二个整数");
         b = scanner.nextInt();
        System.out.println("两数相加的结果为：" + (a + b));
        System.out.println("两数相减的结果为：" + (a - b));
        System.out.println("两数相乘的结果为：" + (a * b));
        System.out.println("两数相除的结果为：" + (a / b));
        System.out.println("两数取余数的结果为：" + (a % b));

		
		
		/*********end*********/
	}

}

第2关：关系运算符

package step2;
import java.util.Scanner;

public class Relative {
	public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        int b=sc.nextInt();
        /*********start*********/
        System.out.println("a==b=" + (a==b));
        System.out.println("a!=b=" + (a!=b));
        System.out.println("a>b=" + (a>b));
        System.out.println("a<b=" + (a<b));
        System.out.println("b>=a=" + (b>=a));
        System.out.println("b<=a=" + (b<=a));
		
		/*********end*********/
	}

}

第3关：逻辑运算符

package step3;
import java.util.Scanner;



public class testLogic {
	public static void main(String[] args) {
        
		Scanner sc=new Scanner(System.in);
  		boolean a=sc.nextBoolean();
        boolean b=sc.nextBoolean();
        boolean c=sc.nextBoolean();
        
		/*********start  *********/
        System.out.println(a&&b);
        System.out.println(b&&c);
        System.out.println(a&&c);
        System.out.println(!b);
       
		/*********end  *********/
	}

}

第4关：三元运算符

package step4;

import java.util.Scanner;

public class TestYear {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
        int year=sc.nextInt();
        boolean result;
        /********start********/
        
        
      result=((year%400)==0)||((year%4==0)&&(year%100!=0))?true:false;
        
        System.out.println(year + "年是否为闰年:" + result);
        
        /********end********/
	}

}

第5关：运算符的优先级

package step5;
import java.util.Scanner;

public class TestDemo5 {
	public static void main(String[] args) {
			Scanner sc=new Scanner(System.in);
		System.out.println("输入：");
		int m=sc.nextInt();
		int n=sc.nextInt();
		
		System.out.println("输出：");
        
		/*****start*****/
		
		System.out.println( m*2+n*2 );
        
		System.out.println( (m-n)%3 );
		
		System.out.println(m*(n+1)-n);
		
		/*****end*****/
	}

}

第6关：选择自测题

B
A
C
C
A
A