Java 程序读取等级&显示等价描述
问题陈述:从 1 到 100 范围内的数字被随机地给定等级作为来自用户的输入，然后将用户的输入等级与给定的情况进行匹配，以产生期望的输出。
现实生活示例
考虑一个 1 到 100 的数字写在一张纸条上。现在，人们开始一个接一个地挑选纸条，并开始以这样的方式组织它们，即在决定制作 10 个不同的罐子之前，他开始将纸条放入 10 个不同的盒子中，以这样的方式排列纸条，在“罐子 A”中编号为 1-10，在“罐子 B”中编号为 11-20，以此类推，直到贴上标签并插入纸条，直到所有的纸条都被组织在贴有标签的罐子中。他这样做是为了轻松算出写在纸条上的数字。
所以用专业术语来说，机器通过这些方式
- 接受用户的输入
- 使用等于运算符(==)匹配等级
- 生成等效描述作为输出
有几种方法从蛮力(幼稚)开始到最理想。下面讨论的很少:
- 使用 If-Else 方法
- 开关案例法
等级的分配使用以下
方法 1:If-Else语句
下面是上述方法的实现
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Read Grade & Displaying Equivalent Desc
// Importing Classes/Files
import java.util.*;
public class GFG {
// Main Driver Method
public static void main(String[] args)
{
// User is supposed to enter grade among them
System.out.println(
"Enter Grade varying from S,A,B,C,D");
String grade = "A";
// Checking whether grade == "S" or not
if (grade == "S") {
System.out.println(
"Student has scored between 90 to 100");
}
// Checking whether grade == "A" or not
else if (grade == "A") {
System.out.println(
"Student has scored between 80 to 90");
}
// Checking whether grade == "B" or not
else if (grade == "B") {
System.out.println(
"Student has scored between 70 to 80");
}
// Checking whether grade == "C" or not
else if (grade == "C") {
System.out.println(
"Student has scored between 60 to 70");
}
// Checking whether grade == "D" or not
else if (grade == "D") {
System.out.println(
"Student has scored between 50 to 60");
}
else {
// Printing message-user pressed some other key
System.out.println(
"The grade you entered is not valid!");
}
}
}
Output
Enter Grade varying from S,A,B,C,D
Student has scored between 80 to 90
接近 2: 切换情况
下面是上述方法的实现
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Read a Grade & Display the Equivalent
// Importing Classes/Files
import java.util.*;
public class GFG {
// Main driver method
public static void main(String args[])
{
// Random grade taken for consideration
String grade = "W";
// Using Switch-Case.
switch (grade) {
// Checking whether grade == "S" or not.
case "S":
System.out.println(
"Student has scored between 90 to 100");
break;
// Checking whether grade == "A" or not.
case "A":
System.out.println(
"Student has scored between 80 to 90");
break;
// Checking whether grade == "B" or not.
case "B":
System.out.println(
"Student has scored between 70 to 80");
break;
// Checking whether grade == "C" or not.
case "C":
System.out.println(
"Student has scored between 60 to 70");
break;
// Checking whether grade == "D" or not.
case "D":
System.out.println(
"Student has scored between 50 to 60");
break;
default:
System.out.println(
"The grade you entered is not valid!");
}
}
}
Output
The grade you entered is not valid!
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