1.编写程序, 输入变量x的值,如果是1,输出x=1,如果是5,输出x=5,如果是 10,输出 x=10,除了以上几个值,都输出x=none。(知识点:if条件语句)
package com.a01; import java.util.*; public class hellowold { public static void main(String[] args) { System.out.println("输入一个变量x"); Scanner input = new Scanner(System.in); int x = input.nextInt(); if (x == 1) { System.out.println("x==1"); } else if (x == 5) { System.out.println("x==5"); } else if (x == 10) { System.out.println("x==10"); } else { System.out.println("x==none"); } } }
2.用switch结构实现第1题
package com.a01; import java.util.*; public class hellowold { public static void main(String[] args) { System.out.println("输入一个变量x"); Scanner input = new Scanner(System.in); int x = input.nextInt(); switch (x) { case 1: x = 1; break; case 5: x = 5; break; case 10: x = 10; break; default: System.out.println("x=none"); } System.out.println("x=" + x); } }
3.判断一个数字是否能被5和6同时整除(打印能被5和6整除),或只能被5整除(打印能被5整 除),或只能被6整除,(打印能被6整除),不能被5或6整除,(打印不能被5或6整除)
package com.a01; import java.util.*; public class hellowold { public static void main(String[] args) { System.out.println("输入一个数"); Scanner input = new Scanner(System.in); int x = input.nextInt(); if(x%6==0&&x%5==0){ System.out.println("能被5和6同时整除"); }else if(x%5==0){ System.out.println("能被5整除"); }else if(x%6==0){ System.out.println("能被6整出"); }else{ System.out.println("不能被5或6整除"); } } }
4.输入一个0~100的分数,如果不是0~100之间,打印分数无效,根据分数等级打印 A(90-100),B(80-89),C,D,E(知识点:条件语句if elseif)package com.a01;
import java.util.*; import java.util.concurrent.SynchronousQueue; public class hellowold { public static void main(String[] args) { System.out.println("输入一个数"); Scanner input = new Scanner(System.in); int x = input.nextInt(); if(x>=90&&x<=100){ System.out.println("A"); }else if(x<90){ System.out.println("B"); }else if(x<80){ System.out.println("C"); }else if(x<70){ System.out.println("D"); }else if(x>=0&&x<60){ System.out.println("E"); }else{ System.out.println("输入不合法"); } } }
5.输入三个整数x,y,z,请把这三个数由小到大输出(知识点:条件语句)
package com.a01; import java.util.*; import java.util.concurrent.SynchronousQueue; public class hellowold { public static void main(String[] args) { System.out.println("输入3个数"); Scanner input = new Scanner(System.in); int x = input.nextInt(); int y = input.nextInt(); int z = input.nextInt(); if(x>y&&y>z){ System.out.println(x+">"+y+">"+z); }else if(x>y&&z>y){ System.out.println(x+">"+z+">"+y); }else if(y>x&&x>z){ System.out.println(y+">"+x+">"+z); }else if(y>x&&z>x){ System.out.println(y+">"+z+">"+x); }else if(z>y&&y>x){ System.out.println(z+">"+y+">"+x); }else if(z>y&&x>y){ System.out.println(z+">"+x+">"+y); } } }