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