初学java练习题【1】

import java.util.Scanner;

public class HelloWorld{
	public static void main(String[] args){
		Scanner scanner=new Scanner(System.in);
		//输入工资
		System.out.println("请输入您的工资：");
		double d1=scanner.nextDouble();

		System.out.println("请输入您的保险：");
		double d2=scanner.nextDouble();

		double d3 =d1-d2-5000;

		if(d3<=0){
			System.out.println("您无须缴纳税");
		}else if(d3<=3000){
			double	d4=d3*0.03;
			System.out.println("应纳税额："+d4);
		}else if(d3<=12000){
			//计算
			double	d5= d3*0.1-210;
			System.out.println("应纳税额："+d5);
		}else if(d3<=25000){
			//计算
			double	d6=d3*0.2-1410;
			System.out.println("应纳税额："+d6);
		}else if(d3<=35000){
			//计算
			double	d6=d3*0.25-2660;
			System.out.println("应纳税额："+d6);
		}else if(d3<=55000){
			//计算
			double	d7=d3*0.3-4410;
			System.out.println("应纳税额："+d7);
		}else if(d3<=80000){
			//计算
			double	d8=d3*0.35-7360;
			System.out.println("应纳税额："+d8);
		}else {
			//计算
			double	d9=d3*45-15160;
			System.out.println("应纳税额："+d9);
		}
	}
}

import java.util.Scanner;

public class HelloWorld{
	public static void main(String[] args){
		

		for(int i=0;i<=100;i++){
			if(i%7==0){
				System.out.println("过"+"\t\t");
			}
		}
	}
}

import java.util.Scanner;

public class HelloWorld {
    public static void main(String[] args) {
        //公鸡的范围
        for (int x1 = 0; x1 < 20; x1++) {
            //母鸡的范围
            for (int y1 = 0; y1 <= 33; y1++) {
                //小鸡
                int  z = 100 - x1 - y1;
                if (z%3==0& x1*5+y1*3+z/3==100){
                    System.out.println(x1);
                    System.out.println(y1);
                    System.out.println(z);
                }
            }
        }
    }
}

结果图