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java中的if....else 结构
判断是素数,还是偶数?
import java.util.Scanner;
public class Boke3 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入一个数字:");
int num = input.nextInt();
if(num%2==0){
System.out.println(num+"是偶数");
}else{
System.out.println(num+"是奇数");
}
}
}
根据成绩输出对应的等级,使用if多分支和switch语句分别实现
a:用if和else来实现.
import java.util.Scanner;
public class Boke4 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入你的分数:");
int num = input.nextInt();
String grade;
if(num>90){
grade = "A";
}else if(num>80){
grade = "B";
}else if(num>70){
grade = "C";
}else if(num>60){
grade = "D";
}else{
grade = "E";
}
System.out.println("成绩为"+num+"属于"+grade+"级");
}
}
b:用swith来实现.
import java.util.Scanner;
public class Boke4 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入你的分数:");
int num = input.nextInt();
String grade;
switch(num/10){
case 10:
case 9:
grade="A";
break;
case 8:
grade="B";
break;
case 7:
grade="C";
break;
case 6:
grade="D";
break;
default:
grade="E";
}
System.out.println("成绩为"+num+"属于"+grade+"级");
}
}
java中的if....else 结构