main.c

关于学生数据管理系统用C编的代码

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>    
    
 /*设置要用到的结构*/
  struct score
{
    int Math;
    int Physics;
    int English;
    int Computer;
    int average;
};

  struct stud
{
    char name[20];
    char ID[20];
    char sex[8];
    char age[5];
    char dorm[20];
    char tel[20];
    struct score *scores;
    struct stud *next;
};

  struct classes
{ 
    char ID[20];
    struct classes *next;
    struct stud *student;
};


/*全局变量声明*/
    FILE *file;
    char path[]="D:\\info.txt";
    struct stud *frontStud=NULL;
    struct stud *currentStud=NULL;
    struct classes *head=NULL;
    struct classes *frontClass=NULL;
    struct classes *currentClass=NULL;
    int mainPage();
    int createClass();
    int registerScore();
    int saveFile();
    int readFile();
    int rankStudents();
    int insertStud();
    int delStud();
    int delClass();
    int modifyStudInfo();
    int modifyScore();
    int rankAll();
    int classAverage();
    int showFailed();
    

/*MAIN函数*/    
    int main ()
{
      mainPage();
      exit(-1);
}

     
/*主页面函数*/  
    int mainPage ()
{
      int i,n;
      
      clrscr();
      printf("\n\n");
      printf("\t\t\tEDUCATIONAL ADMINISTRATION SYSTEM\n");
      printf("\t    ");
      for(i=0;i<57;i++)
    {
        printf("*");
    }
      printf("\n");
      printf("\t    *   1.Create classes and students in it.\t\t    *\n");
      printf("\t    *   2.Insert a student in some certain class.\t    *\n");
      printf("\t    *   3.Modify a class's students' information.\t    *\n");
      printf("\t    *   4.Delete a certain student's information.\t    *\n");
      printf("\t    *   5.Delete a certain class.\t\t\t    *\n");
      printf("\t    *   6.Register the scores of the students.\t\t    *\n");
      printf("\t    *   7.Modify a certain student's score.\t\t    *\n");
      printf("\t    *   8.Rank a certain class's students.\t\t    *\n");
      printf("\t    *   9.Show all average score of any subject.\t    *\n");
      printf("\t    *   10.Show failures' bill.\t\t\t\t    *\n");
      printf("\t    *   Others.Exit the program.\t\t\t    *\n");
      printf("\t    ");
      for(i=0;i<57;i++)
    {
        printf("*");
    }
      printf("\n\n");
      if((file=fopen(path,"r"))!=NULL)
    {
    	readFile();
    	printf("Read existent infomation successfully!\n\n");
    	fclose(file);
    }
      printf("Please choose the operation you want to do: ");
      scanf("%d%*c",&n);
      switch(n)
    {
    	case 1: createClass();
    	        break;
    	case 2: insertStud();
    	        break;
    	case 3: modifyStudInfo();
    	        break;
    	case 4: delStud();
    	        break;
    	case 5: delClass();
    	        break;
    	case 6: registerScore();
    	        break;
    	case 7: modifyScore();
    	        break;
    	case 8: rankAll();
    	        break;
    	case 9: classAverage();
    	        break;
    	case 10: showFailed();
    	         break;
    	default: exit(-1);
    }
}

/*创建班级和它的学生的函数*/
    int createClass()
{
      char temp,continueStud,continueClass,rb[10];
      int i=0,j=0;
            
      for(continueClass='Y',i=1;continueClass=='Y'||continueClass=='y';i++)
    {
    	
    /*创建一个班级*/
        clrscr();
        
        if(currentClass!=NULL)  /*如果已经读到了数据，要用此部*/
      {
      	  i++;
          frontClass=currentClass;
      }
          
        printf("\n\n");
        currentClass=(struct classes *)malloc(sizeof(struct classes));
        if(currentClass==NULL)
      {
    	  printf("Can't assign the place for the class!\n");
    	  exit(-1);
      }    
        if(head==NULL)
          head=currentClass;
        if(i!=1)
          frontClass->next=currentClass;
          
        printf("Please input the number of the class: ");
        scanf("%s%*c",currentClass->ID);
        
        currentClass->next=NULL;
        currentClass->student=NULL;
        
        printf("\nNow, begin to create students.\n");
      
        for(continueStud='Y',j=1;continueStud=='Y'||continueStud=='y';j++)
      {         	      
          currentStud=(struct stud *)malloc(sizeof(struct stud));
          if(currentStud==NULL)
        {
      	    printf("Can't assign the place for the student!\n");
      	    exit(-1);
        }
          if(j!=1)
            frontStud->next=currentStud;
   
       /*录入学生的基本情况*/  
          if(currentClass->student==NULL)
            currentClass->student=currentStud;
          
          printf("\nPlease input the name of the student: ");
          gets(currentStud->name);
          printf("Please input the ID of the student: ");
          gets(currentStud->ID);
        currentSex:
          printf("If male then input \"M\" or else \"F\": ");
          scanf("%c%*c",&temp);
          switch(temp)
        {
    	    case 'M':
    	    case 'm': strcpy(currentStud->sex,"Male");
    	              break;
    	    case 'F':
    	    case 'f': strcpy(currentStud->sex,"Female");
    	              break;
    	    default: gets(rb);
    	             goto currentSex;
        }
          printf("Please input the age of the student: ");
          gets(currentStud->age);
          printf("Please input the number of the student's dormitory: ");
          gets(currentStud->dorm);
          printf("Please input the telephone of the student: ");
          gets(currentStud->tel);
          
          currentStud->next=NULL;
          currentStud->scores=NULL;
          
          frontStud=currentStud;
      
          printf("\nContinue to create students (Y/N)? ");
          scanf("%c%*c",&continueStud);
          currentStud->next=NULL;
      }
        
        frontClass=currentClass;
        printf("\nContinue to create classes (Y/N)? ");
        scanf("%c%*c",&continueClass);
        currentClass->next=NULL;
    }
      rankStudents();
      saveFile();
      mainPage();
}


/*登记各班学生成绩的函数*/
    int registerScore()
{
      char classID[20],temp='';
      
    continueFind:
      clrscr();
      printf("\n\nPlease input the number of the class you want to register: ");
      gets(classID);
      
      if(head==NULL)     /*库中没有数据*/
    {
    	printf("No information!\n\n");
    	printf("Go to the main page (Y/N)? ");
    	temp='';
    	scanf("%c%*c",&temp);
    	if(temp=='Y'||temp=='y')
    	  mainPage();
    	else
    	  exit(-1);
    }
      currentClass=head;
      while(currentClass->next!=NULL&&strcmp(currentClass->ID,classID)!=0) /*遍历链表*/
    {
    	frontClass=currentClass;
    	currentClass=frontClass->next;
    }
      if(currentClass->next==NULL&&strcmp(currentClass->ID,classID)!=0) /*找不到此班*/
    {
    	printf("There is no accordant class!\n\n");
    	printf("Continue to find the class (Y/N)? ");
    	temp='';
    	scanf("%c%*c",&temp);
    	if(temp=='Y'||temp=='y')
    	  goto continueFind;
    	else
          mainPage();
    }
                                       
     /*找到该班并为该班同学登记成绩*/
      for(currentStud=currentClass->student;currentStud!=NULL;)
    {
    	currentStud->scores=(struct score *)malloc(sizeof(struct score));
    	if(currentStud->scores==NULL)
      {
    	  printf("Can't assign the place for the student!\n");
    	  exit(-1);
      }
      
        printf("\nThe current student--%s   ID--%s\n",currentStud->name,currentStud->ID);
        printf("Please input the score for Math: ");
        scanf("%d",&(currentStud->scores->Math));
        printf("Please input the score for Physics: ");
        scanf("%d",&(currentStud->scores->Physics));
        printf("Please input the score for English: ");
        scanf("%d",&(currentStud->scores->English));
        printf("Please input the score for Computer: ");
        scanf("%d",&(currentStud->scores->Computer));
        currentStud->scores->average=(currentStud->scores->Math+currentStud->scores->Physics+currentStud->scores->English+currentStud->scores->Computer)/4;
        
        frontStud=currentStud;
        currentStud=frontStud->next;
    }  
    
      printf("\nAll of the students in the class have been registered!\n\n");
      printf("Continue to register another class (Y/N)? ");
      temp='';
      scanf("%*c%c%*c",&temp);
      if(temp=='Y'||temp=='y')
    {
    	saveFile();
    	readFile();
    	goto continueFind;
    }
      else
    {
    	saveFile();
        mainPage();
    }
}


/*将数据存入文件的函数*/
    int saveFile()
{
      int num=0;   /*一个班的学生总数*/
      
      if((file=fopen(path,"w"))==NULL)
    {
    	printf("Can't open the file: %s!\n",path);
    	exit(-1);
    }
    
    /*打开了文件，开始写入信息*/      
      for(currentClass=head,num=1;currentClass!=NULL;)
    {
    	fprintf(file,"*%s\n",currentClass->ID);
    	for(currentStud=currentClass->student;currentStud!=NULL;num++)
      {
    	  fprintf(file,"~%s;%s;%s;%s;",currentStud->name,currentStud->ID,currentStud->sex,currentStud->age);
    	  fprintf(file,"%s;%s;",currentStud->dorm,currentStud->tel);
    	  
    	  if(currentStud->scores!=NULL)
    	{
    	    fprintf(file,"%d;%d;",currentStud->scores->Math,currentStud->scores->Physics);
    	    fprintf(file,"%d;%d;",currentStud->scores->English,currentStud->scores->Computer);
    	    fprintf(file,"%d;\n",currentStud->scores->average);
    	}
    	  else
    	{
    	    fprintf(file,"\n");
    	}
    	  
    	  frontStud=currentStud;
    	  currentStud=frontStud->next;
      }
        frontClass=currentClass;
    	currentClass=frontClass->next;
    }     
      fclose(file);
}


/*从文件中读取数据的函数*/
    int readFile()
{
      char string[130],c,*token;
      char step[]=";\n";   /*一行数据的分界符*/
      int r=0,flag=0;
      
      if((file=fopen(path,"r"))==NULL)
    {
    	printf("Can't open the file!\n");
    	exit(-1);
    }
    
      head=NULL;
      while((c=fgetc(file))!=-1)
    {
    	flag=0;
    	switch(c)
      {
      	  case '*': currentClass=(struct classes *)malloc(sizeof(struct classes));
      	            if(currentClass==NULL)
      	          {
      	              printf("Can't assign the place for the class!\n");
      	              fclose(file);
      	              exit(-1);
      	          }
      	          
      	            currentClass->next=NULL;
      	            currentClass->student=NULL;
      	            
      	            if(head==NULL)
      	              head=currentClass;