题解 | #学分绩点#

import java.util.Scanner;
public class Main{
    public static double getPoint(int grade){
        if(grade>=90&&grade<=100){
            return 4.0;
        }else if(grade>=85&&grade<=89){
            return 3.7;
        }else if(grade>=82&&grade<=84){
            return 3.3;
        }else if(grade>=78&&grade<=81){
            return 3.0;
        }else if(grade>=75&&grade<=77){
            return 2.7;
        }else if(grade>=72&&grade<=74){
            return 2.3;
        }else if(grade>=68&&grade<=71){
            return 2.0;
        }else if(grade>=64&&grade<=67){
            return 1.5;
        }else if(grade>=60&&grade<=63){
            return 1.0;
        }else{
            return 0.0;
        }
    }
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] score=new int[n];
        for(int i=0;i<n;i++){
            score[i]=sc.nextInt();
        }
        int[] grade=new int[n];
        for(int i=0;i<n;i++){
            grade[i]=sc.nextInt();
        }
        double sp=0;double gp=0;
        for(int i=0;i<n;i++){
            gp+=getPoint(grade[i])*score[i];
            sp+=score[i];
        }
        double GPA=gp/sp;
        System.out.printf("%.2f",GPA);
        // System.out.printf("%f",gp);//67.1
        // System.out.printf("%f",sp);//25

    }
}

这个题用C 语言写总是通不过这个示例的为什么？？？ 计算的总是2.52 然而用Java算出来的话就是2.68

为什么？？？？？？