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 qin; import java.util.*; public class ling { public static void main(String[] args) { System.out.println("请输入x的值"); Scanner input=new Scanner(System.in); int x = input.nextInt(); if(x==1) { System.out.println("x="+x); }else if(x==5) { System.out.println("x="+x); }else if(x==10) { System.out.println("x="+x); }else { System.out.println("x=none"); } } }
2.用switch结构实现第1题
package qin; import java.util.*; public class ling { public static void main(String[] args) { System.out.println("请输入x的值"); Scanner input=new Scanner(System.in); int x = input.nextInt(); switch(x/1) { case 1: System.out.println("x="+x);break; case 5: System.out.println("x="+x);break; case 10: System.out.println("x="+x);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 qin; import java.util.*; public class ling { public static void main(String[] args) { System.out.println("请输入一个数字"); Scanner input=new Scanner(System.in); int x = input.nextInt(); if(x%5==0&&x%6==0) { System.out.println("可以同时被5和6整除"); }else if(x%5==0) { System.out.println("可以被5整除"); }else if(x%6==0) { System.out.println("可以被6整除"); }else { System.out.println("不可以被5和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 qin;
import java.util.*;
public class ling {
import java.util.*;
public class ling {
public static void main(String[] args) {
System.out.println("请输入一个0到100的分数");
Scanner input=new Scanner(System.in);
double x = input.nextDouble();
if(x>100||x<0) {
System.out.println("分数无效");
}else if(x>=90&&x<=100) {
System.out.println("A");
}else if(x>=80&&x<=89) {
System.out.println("B");
}else if(x>=80&&x<=79) {
System.out.println("C");
}else if(x>=70&&x<=69) {
System.out.println("D");
}else {
System.out.println("E");
}
}
}
System.out.println("请输入一个0到100的分数");
Scanner input=new Scanner(System.in);
double x = input.nextDouble();
if(x>100||x<0) {
System.out.println("分数无效");
}else if(x>=90&&x<=100) {
System.out.println("A");
}else if(x>=80&&x<=89) {
System.out.println("B");
}else if(x>=80&&x<=79) {
System.out.println("C");
}else if(x>=70&&x<=69) {
System.out.println("D");
}else {
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 qin; import java.util.*; public class ling { public static void main(String[] args) { System.out.println("请输入三个整数,由小到大排列"); Scanner input=new Scanner(System.in); int a=input.nextInt(); int b=input.nextInt(); int c=input.nextInt(); int max,middle,min; max = a; if(b > a && b > c ){ max = b; } if(c > a && c > b){ max = c; } min = a; if(b < a && b < c){ min = b; } if(c < a && c < b){ min = c; } middle = (a + b + c) - (max + min); System.out.println(min + ","+ middle + "," + max); } }