creat.cpp

内有说明

//creat用于创建学生成绩信息文件
#include "creat.h"

void CreatFile()
{
  FILE *fp = NULL;
  Student Tmps;

  char DataFile[40] = "";
  int count = 1;

  //====输入存放学生成绩信息的文件名======
  printf("\nplease input new file of score.");
  printf("\nnotice:name of file can't exceed 8 characters.suffix can't exceed 3 characters,part of exceed will be discarded.\n");
  gets(DataFile);

  //如果用户没有输入，则循环提示用户输入
  while (*DataFile == ('\0'))
  {
    printf("\nplease input new file of score.");
    printf("\nnotice:name of file can't exceed 8 characters.suffix can't exceed 3 characters,part of exceed will be discarded.\n");
    gets(DataFile);
  }

  //用二进制写的方式打开文件，即创建文件
  fp = fopen(DataFile, "wb+");

  //如果当前文件不存在，提示打开文件失败
  if (fp == NULL)
  {
    printf("\nopen file %s faile!end with any key.\n", DataFile);
    perror("open file fail");

    getch();
    exit(1);
  }

  //如果成功打开或创建文件，则提示输入学生学号，姓名，各科成绩等相关信息
  printf("input number,name and grade of english,math and cheinese.number is 0 means input is end.\n ");
  printf("number is not exceed 9 figures,name is not exceed 20 characters,range od grade:0.00~1000.00\n");

  //循环从键盘上读取用户输入的学号，姓名，各科成绩等相关信息
  while (count == SIZE)
  {
    //输入学号，如为0则停止输入
    printf("\ninput 'number=0' means end input.\n");
    printf("number:");
    scanf("%ld", &(Tmps.Number));
    if (Tmps.Number == 0)
      break;

    //提示输入学生姓名
    printf("name:");
    scanf("%s", Tmps.Name);

    //提示输入学生语文成绩
    printf("chinesescore:");
    scanf("%f", &Tmps.chinesescore);

    //提示输入学生数学成绩
    printf("mathscoer:");
    scanf("%f", &Tmps.mathscore);

    //用公式自动计算学生总成绩
    Tmps.heji = Tmps.chinesescore + Tmps.mathscore;

    printf("\n");

    //如果遇到无法写入文件的异常，则加以提示
    if (fwrite(&Tmps, sizeof(Student), 1, fp) != 1)
    {
      printf("\nwrite file %s fail!end with any key\n", DataFile);
      perror("write file fail!");
      getch();
      exit(1);
    }
    count++;
  }

  //如果输入的数据量超过最大允许的范围，则提示数据不能录入
  if (count > SIZE)
    printf("\nsorry,number of data can not exceed %d\n", SIZE);
  fclose(fp);



  //在屏幕上显示文件内容
  //clrscr();
  printf("the data you input is store successful %s in file.\n", DataFile);
  printf("content as follow\n");

  fp = fopen(DataFile, "rb");
  if (fp == NULL)
  {
    printf("\nopen file %s fail!end with any key\n", DataFile);
    perror("open file fail!");
    getch();
    exit(1);
  }

  printf("\nnumber\tname\tchinesescore\tmathscore\tjihe\n");
  while (fread(&Tmps, sizeof(Student), 1, fp))
  {
    printf("\n%ld\t%s\t%4.2f\t%4.2f\t%4.2f\n", Tmps.Number, Tmps.Name, Tmps.chinesescore, Tmps.mathscore, Tmps.heji);
  }

  fclose(fp);
}