rage.java

辨别成绩的小程序,比如说得5分是A,得4分是B,依次类推

import java.io.*;

public class rage {
	public static void main(String args[]) throws IOException
	{
		double average;
		int counter, grade ,total;
		
		total = 0;
		counter = 0;
		
		System.out.print("Enter letter grade, Z to end: ");
		System.out.flush();
		grade = System.in.read();
		
		while (grade!='Z') {
			if (grade=='A')
			  total=total+4;
			else if (grade=='B')
			  total=total+3;
			else if (grade=='C')
			  total=total+2;
			else if (grade=='D')
			  total=total+1;
			else if (grade=='F')
			  total=total+0;
			  
	        System.in.skip(2);
	        counter=counter+1;
	        System.out.print("Enter letter grade, Z to end: ");
	        System.out.flush();
	        grade=System.in.read();
	     }
	     if (counter!=0) {
			average=(double) total/counter;
			System.out.println("Class average is" + average);
			}
			else
				System.out.println("NO grades were entered");
				}
				}