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。
package pra; import java.util.Scanner; public class Text1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入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 pra; import java.util.Scanner; public class Text1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入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"); } } }
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 pra; public class Text1 { public static void main(String[] args) { // TODO Auto-generated method stub for(int i = 1; i <= 100; i++ ) { if (i % 5 == 0 && i % 6 == 0) { System.out.println(i + "可以被5和6同时整除"); } else if(i % 5 == 0 && i % 6 != 0) { System.out.println(i + "只能被5整除"); } else if(i % 6 == 0 && i % 5 != 0) { System.out.println(i + "只能被6整除"); } else if(i % 6 != 0 && i % 5!= 0) { System.out.println(i + "不能被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 else if)
package pra; import java.util.Scanner; public class Text1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入分数:"); int x = input.nextInt(); if(x > 100){ System.out.println("输入的值无效"); }else if(x >= 90){ System.out.println("A级别"); }else if(x >= 80){ System.out.println("B级别"); }else if(x >= 70){ System.out.println("C级别"); }else if(x >= 60){ System.out.println("D级别"); }else if(x < 60){ System.out.println("E级别"); } } }
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 pra; import java.util.Scanner; public class Text1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.print("请输入第一个数X:"); int a = input.nextInt(); System.out.println(); System.out.print("请输入第二个数Y:"); int b = input.nextInt(); System.out.println(); System.out.print("请输入第三个数Z:"); int c = input.nextInt(); if(a>b&&b>c){ System.out.println(c+"<"+b+"<"+a); }else if(a>c&&c>b){ System.out.println(b+"<"+c+"<"+a); }else if(b>a&&a>c){ System.out.println(c+"<"+a+"<"+b); }else if(b>c&&c>a){ System.out.println(a+"<"+c+"<"+b); }else if(c>a&&a>b){ System.out.println(b+"<"+a+"<"+c); }else if(c>b&&b>a){ System.out.println(a+"<"+b+"<"+c); } } }