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 tx; import java.util.Scanner; public class test { public static void main(String[] args) { // TODO Auto-generated method stub; Scanner input=new Scanner(System.in); System.out.println("输入x的值"); 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 tx; import java.util.Scanner; public class test { public static void main(String[] args) { // TODO Auto-generated method stub; Scanner input=new Scanner(System.in); System.out.println("输入x的值"); 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"); break; } } }
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 tx; import java.util.Scanner; public class test { public static void main(String[] args) { // TODO Auto-generated method stub; Scanner input=new Scanner(System.in); System.out.println("输入一个值"); int x=input.nextInt(); if (x%5==0&&x%6==0) { System.out.println("能被5和6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整除"); }else if(x%5!=0||x%6!=0){ 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 tx; import java.util.Scanner; public class test { public static void main(String[] args) { // TODO Auto-generated method stub; Scanner input=new Scanner(System.in); System.out.println("输入一个0~100的分数"); int x=input.nextInt(); if(x>=90&&x<100){ System.out.println("A"); }else if(x>=80&&x<90){ System.out.println("B"); }else if(x>=70&&x<80){ System.out.println("C"); }else if(x>=60&&x<70){ System.out.println("D"); }else if(x<60){ 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 tx; import java.util.Scanner; public class test { public static void main(String[] args) { // TODO Auto-generated method stub; Scanner input=new Scanner(System.in); System.out.println("输入一个三个整数x,y,z"); int x=input.nextInt(); int y=input.nextInt(); int z=input.nextInt(); if(x>y&&y>z){ System.out.println("输出"+z+","+y+","+x); }else if(x>z&&z>y){ System.out.println("输出"+y+","+z+","+x); }else if(y>x&&x>z){ System.out.println("输出"+z+","+x+","+y); }else if(y>z&&z>x){
System.out.println("输出"+x+","+z+","+y);
}else if(z>y&&y>x){
System.out.println("输出"+x+","+y+","+z);
}else if(z>x&&x>y){ System.out.println("输出"+y+","+x+","+z); } } }