reset.c

学生成绩管理系统： 初始的学生成绩信息文件名为porduct

#include "stdio.h"
ResetRecord(int n)
{
int i,j;
int recnum=0;
int minscore=100;
student r[5];
FILE *fp;
student Pro;
student TmpS;
getchar();
/*获取用户姓名，和用户成绩一起放入用户结构体变量*/
printf("\nWhat is you name?");
scanf("%s",Pro.name);
Pro.score=n;
/*读取排行榜内容，统计排行榜中记录数量*/
/*以读方式打开文件*/
fp=fopen("record","rb");
if (fp == NULL)
    {
        printf("\nOpen file fail!End with any key\n");
        perror("Open file fail");
        getch();
        exit(1);
    }
/*循环从文件中读取纪录,放于数组中，数组长度为5*/
while(((fread(&TmpS,sizeof(student),1,fp)) != (int)NULL)&&(recnum<5))
    {
     strcpy(r[recnum].name,TmpS.name);
     r[recnum].score=TmpS.score;
     recnum++;
    }
fclose(fp);
/*如记录数量小于5，说明排行榜未满，则将用户结构体写入数组，即直接入榜。*/
if(recnum<5)
    {
     strcpy(r[recnum].name,Pro.name);
     r[recnum].score=Pro.score;
     recnum++;
    }
/*如记录数量为5，排行榜已满，则找出排行榜中成绩最低纪录*/
/*如果当前考试者的分数比此分数高，则替换*/
else
    {
    /*循环找出5个中的最低分数*/
    for(i=0;i<5;i++)
        {
         if(r[i].score<minscore)
            {
            minscore=r[i].score;
            j=i;
            }
        }
    /*用户成绩和最低纪录比较，如比最低纪录高，则替换，让用户入榜。最低者落榜*/
    if(Pro.score>=r[j].score)
        {
         strcpy(r[j].name,Pro.name);
         r[j].score=Pro.score;
        }
    }
/*将刷新后的数组写入排行榜文件，完成排行榜的刷新*/
fp=fopen("record","wb");
if (fp == NULL)
    {
        printf("\nOpen file fail!End with any key\n");
        perror("Open file fail");
        getch();
        exit(1);
    }
for(i=0;i<recnum; i++)
        {
            if(fwrite(&r[i],sizeof(student),1,fp)!=1)
            {
                printf("\nWrite file fail!end with anykey.\n");
                perror("Write file fail!");
                    getch();
                    exit(1);
            }
        }
fclose(fp);
/*显示刷新后的排行榜*/
fp=fopen("record","rb");
    if (fp == NULL)
    {
        printf("\nOpen file fail!End with any key \n");
        perror("Open file fail");
        getch();
        exit(1);
    }
    printf("\nthe record is:\n");
    printf("\nName\tscore\n");
    while(fread(&TmpS,sizeof(student),1,fp) != (int)NULL)
    {
        printf("\n%s\t%d\n",TmpS.name,TmpS.score);
    }
    fclose(fp);
}