文件操作---录入成绩并计算均分，写到文件中，打印到屏幕上

#include <stdio.h>
#include <stdlib.h>
#define N 30

typedef struct data
{
   int year;
   int month;
   int day;
}DATE;

typedef struct student
{
   long studentID;
   char studentName[10];
   char studentSex;
   DATE birthday;
   int score[4];
   float aver;
}STUDENT;

void InputScore(STUDENT stu[],int n,int m)
{
   int i,j;
   for(i=0;i<n;i++)
   {
       printf("Input record %d:\n",i+1);
       scanf("%ld",&stu[i].studentID);
       scanf("%s",stu[i].studentName);
       scanf(" %c",&stu[i].studentSex);
       scanf("%d",&stu[i].birthday.year);
       scanf("%d",&stu[i].birthday.month);
       scanf("%d",&stu[i].birthday.day);
       for(j=0;j<m;j++)
       {
           scanf("%d",&stu[i].score[j]);
       }
   }
}

void AverScore(STUDENT stu[],int n,int m)
{
   int i,j,sum[N];
   for(i=0;i<n;i++)
   {
       sum[i] = 0;
       for(j=0;j<m;j++)
       {
           sum[i] = sum[i] + stu[i].score[j];
       }
       stu[i].aver = (float)sum[i]/m;
   }

}

void WritetoFile(STUDENT stu[],int n)
{
   FILE *fp;
   if((fp = fopen("student.txt","w")) == NULL)
   {
       printf("Failure to open student.txt!\n");
       exit(0);
   }
   fwrite(stu,sizeof(STUDENT),n,fp);
   fclose(fp);
}

int ReadformFile(STUDENT stu[])
{
   FILE *fp;
   int i;
   if((fp = fopen("student.txt","r")) == NULL)
   {
       printf("Failure to open student.txt!\n");
       exit(0);
   }
   for(i=0;!feof(fp);i++)
   {
       fread(&stu[i],sizeof(STUDENT),1,fp);
   }
   fclose(fp);
   printf("Totle student is %d.\n",i-1);
   return i-1;
}

void PrintScore(STUDENT stu[],int n,int m)
{
   int i,j;
   for(i=0;i<n;i++)
   {
       printf("%10ld %8s %3c %6d /%02d/%02d",
       stu[i].studentID,stu[i].studentName,stu[i].studentSex,
       stu[i].birthday.year,stu[i].birthday.month,stu[i].birthday.day);
       for(j = 0;j<m;j++)
       {
           printf("%4d",stu[i].score[j]);
       }
       printf("%6.1f\n",stu[i].aver);
   }
}

int main()
{
   STUDENT stu[N];
   int n;
   printf("How many student?\n");
   scanf("%d",&n);
   InputScore(stu,n,4);
   AverScore(stu,n,4);
   WritetoFile(stu,n);
   n = ReadformFile(stu);
   PrintScore(stu,n,4);
   return 0;

}

文件操作---录入成绩并计算均分，写到文件中，打印到屏幕上

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