原文： https://beginnersbook.com/2017/09/java-program-to-calculate-and-display-student-grades/
该程序根据用户在每个科目中输入的标记计算学生的成绩。程序根据此逻辑打印等级。
如果标记的平均值>= 80则打印等级'A'
如果平均值< 80且>= 60则打印等级'B'
如果平均值< 60和>= 40然后打印等级'C'
否则打印等级'D'
要理解本程序，您应该具备以下 Java 概念的知识：
import java.util.Scanner;
public class JavaExample
{
public static void main(String args[])
{
/* This program assumes that the student has 6 subjects,
* thats why I have created the array of size 6\. You can
* change this as per the requirement.
*/
int marks[] = new int[6];
int i;
float total=0, avg;
Scanner scanner = new Scanner(System.in);
for(i=0; i<6; i++) {
System.out.print("Enter Marks of Subject"+(i+1)+":");
marks[i] = scanner.nextInt();
total = total + marks[i];
}
scanner.close();
//Calculating average here
avg = total/6;
System.out.print("The student Grade is: ");
if(avg>=80)
{
System.out.print("A");
}
else if(avg>=60 && avg<80)
{
System.out.print("B");
}
else if(avg>=40 && avg<60)
{
System.out.print("C");
}
else
{
System.out.print("D");
}
}
}输出：
Enter Marks of Subject1:40
Enter Marks of Subject2:80
Enter Marks of Subject3:80
Enter Marks of Subject4:40
Enter Marks of Subject5:60
Enter Marks of Subject6:60
The student Grade is: B