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 char2; import java.util.*; public class Tes { public static void main(String[] args) { Scanner input = new Scanner (System.in); System.out.println("输入x"); 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.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。用switch结构实现
package char2; import java.util.*; public class Tes { public static void main(String[] args) { Scanner input = new Scanner (System.in); System.out.println("输入x"); int x=input.nextInt(); switch(x){ case 1: System.out.println("x=1"); break; case 5: System.out.println("x=5"); break; case 10: System.out.println("x=10"); break; default: System.out.println("x=none"); } } }
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 char2; import java.util.*; public class Test2 { public static void main(String[] args) { Scanner input = new Scanner (System.in); System.out.println("输入一个数"); int a=input.nextInt(); if(a%5==0&&a%6==0){ System.out.println("a能被5和6整除"); }else if(a%5==0){ System.out.println("a能被5整除"); }else if(a%6==0){ System.err.println("a能被6整除"); }else{ System.out.println("a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 char1; import java.util.*; public class Test3 { public static void main(String[] args) { Scanner input = new Scanner (System.in); System.out.println("输入一个分数"); int b=input.nextInt(); if(b<=100&&b>=90){ System.out.println("A"); }else if(b<=89&&b>=80){ System.out.println("B"); }else if(b<=79&&b>=70){ System.out.println("C"); }else if(b<=69&&b>=60){ System.out.println("D"); }else if(b<=59&&b>=50){ System.out.println("E"); } } }
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 char1; import java.util.*; public class Test3 { public static void main(String[] args) { Scanner input = new Scanner (System.in); System.out.println("输入三个数"); int x=input.nextInt(); int y=input.nextInt(); int z=input.nextInt(); if(x>y&&y>z){ System.out.println(+z+","+y+","+x); }else if(x>z&&z>y) { System.out.println(+y+","+z+","+x); }else if(y>x&&x>z) { System.out.println(+z+","+x+","+y); }else if(y>z&&z>x) { System.out.println(+x+","+z+","+y); }else if(z>y&&y>x) { System.out.println(+x+","+y+","+z); }else if(z>x&&x>y) { System.out.println(+y+","+x+","+z); } } }