学生成绩管理

#include <stdio.h>
       double HighScore; /*全局变量，最高分*/
       double LowScore; /*全局变量，最低分*/
       double SumScore; /*全局变量，总分*/
       double AverageScore; /*全局变量，平均分*/
       void calcscore(int n)
       {
           int i;
           double j;
           SumScore=0;
           HighScore=-1;
           LowScore=100;
           for(i=1;i<=n;i++)
           {
           scanf("%lf",&j);
           if(j>HighScore)
           {

            HighScore=j;}
           if(j<LowScore)
           {

            LowScore=j;}
            SumScore+=j;
           }
           AverageScore=SumScore/n;
       } /*函数声明*/
       int main()
       {
           int n;
           scanf("%d",&n);
           calcscore(n);
           printf("%g %g %g %g\n",HighScore,LowScore,SumScore,AverageScore);
           return 0;
        }