第四次作业
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 mjm; import java.util.Scanner; public class ddd { public static void main(String[] args) { System.out.println("请输入x"); Scanner input=new Scanner(System.in); int x=input.nextInt(); if(x==1){ System.out.println("1"); } else if(x==5){ System.out.println("5"); } else if(x==10){ System.out.println("10"); } else{ System.out.println("none"); } } }
2.用switch结构实现第1题
package mjm; import java.util.Scanner; public class ddd { public static void main(String[] args) { System.out.println("请输入x"); Scanner input=new Scanner(System.in); int x=input.nextInt(); switch(x){ case 1: System.out.println("1"); break; case 5: System.out.println("5"); break; case 10: System.out.println("10"); break; default: System.out.println("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 mjm; import java.util.Scanner; public class ddd { public static void main(String[] args) { System.out.println("请输入x"); Scanner input=new Scanner(System.in); 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&&x%6!=0){ System.out.println("能被5整除"); } else if(x%6==0&&x%5!=0){ System.out.println("能被6整除"); } 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 mjm; import java.util.Scanner; public class ddd { public static void main(String[] args) { System.out.println("请输入0-100之间的分数x"); Scanner input=new Scanner(System.in); int x=input.nextInt(); if(x<60){ System.out.println("E"); } else if(x<=70){ System.out.println("D"); } else if(x<=80){ System.out.println("C"); } else if(x<=90){ System.out.println("B"); } else if(x<=100){ System.out.println("A"); } else{ System.out.println("分数无效"); } } }
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 mjm;
import java.util.Scanner;
public class ddd {
public static void main(String[] args) {
ddd nc = new ddd();
int a, b, c;
System.out.println("输入三个数字");
a = nc.input();
b = nc.input();
c = nc.input();
if (a > b) {
int t = a;
a = b;
b = t;
}
if (a > c) {
int t = a;
a = c;
c = t;
}
if (b > c) {
int t = b;
b = c;
c = t;
}
System.out.println(a + " " + b + " " + c);
}
public int input() {
int value = 0;
Scanner s = new Scanner(、
System.in);
value = s.nextInt();
return value;
}
public void compare(int x, int y) {
if (x > y) {
int t = x;
x = y;
y = t;
}
}
}