无聊写了个巨简单无比的后台小程序,算练手-__________-,好久没用纯C了

最新推荐文章于 2024-04-13 16:24:47 发布
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这是一个使用C语言实现的学生信息管理系统，支持添加、删除、更新学生信息等功能，并能通过姓名、学号等条件查找学生记录。系统还提供了文件操作功能，能够加载和保存学生数据。
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据说不在vc++9.0上就会出N多错误...
#include <stdio.h> 
#include <string.h> 
#define MAX_LEN 255 
#define MAX_STU_NUM 10000 
#define ADD_STU_INFO "add" 
#define DEL_STU_INFO "del" 
#define UP_STU_INFO "update" 
#define FIN_STU_INFO "find" 
#define OPEN_FILE "open" 
#define SAVE_FILE "save" 
#define OTH_SAVE_FILE "asave" 
#define SHOW_ALL "show" 
#define HELP "help" 
#define QUIT "quit" 
#define _swap(a,b) tmp=a,a=b,b=tmp;/*交换*/ 
#define _cmp(a,b) strcmp(a,b)<0/*按字典序升*/ 
FILE *file;
struct String
{
    char str[MAX_LEN];
};
struct Stu
{
    String _stu_name,_stu_num;
    unsigned int _stu_c_score,_stu_eng_score;
};
void print(char *str,int _blank_num)
{int i;for(i=1;i<=_blank_num;i++)putchar(' ');printf("%s/n",str);}
void cin(){printf(">>");}
void add(Stu *stu,int &_cur_num)
{
    if(_cur_num>MAX_STU_NUM){print(">>Stu_Number_Exceed!",0);return;}
    scanf("%s %s %d %d",&stu[_cur_num]._stu_num,&stu[_cur_num]._stu_name,&stu[_cur_num]._stu_c_score,&stu[_cur_num]._stu_eng_score);
    print(">>Add success!",0);
    _cur_num++;
}
void del(Stu *stu,int &_cur_num)
{
    int id,i;
    scanf("%d",&id);
    if(id<0||id>_cur_num){print(">>Stu_Number_Range_Exceed!",0);return;}
    --_cur_num;
    for(i=id;i<_cur_num;i++)
        stu[i]=stu[i+1];
    print(">>Delete success!",0);
}
void sort(Stu *stu,int _num)/*按学号排序_字典序*/
{
    int i,j;
    Stu tmp;
    for(i=0;i<_num-1;i++)
        for(j=i+1;j<_num;j++)
            if(_cmp(stu[j]._stu_num.str,stu[i]._stu_num.str)) _swap(stu[i],stu[j]);
}
void save(Stu *stu,int _stu_num)/*保存信息*/
{
    int i;
    if(file==NULL){print(">>Error!No file open!",0);return;}
    fwrite(&_stu_num,sizeof(int),1,file);
    for(i=0;i<_stu_num;i++)
    fwrite(&stu[i],sizeof(Stu),1,file);
    fclose(file);
    print(">>Save success!",0);
}
void asave(Stu *stu,int _stu_num,String url)/*保存信息*/
{
    int i;FILE *file=fopen(url.str,"wb+");
    if(file==NULL){print("ERROR!",10);return;}
    fwrite(&_stu_num,sizeof(int),1,file);
    for(i=0;i<_stu_num;i++)
    fwrite(&stu[i],sizeof(Stu),1,file);
    fclose(file);
    print(">>Asave success!",0);
}
void change(char *str)/*转化为小写，忽略命令大小写^.^*/
{
    int i,len=strlen(str);
    for(i=0;i<len;i++)
        if(str[i]>='A'&&str[i]<='Z') str[i]+=32;
}
void open(Stu *stu,String url,int& _stu_num)/*打开文件读入信息并判断文件是否存在*/
{
    int i;
    file=fopen(url.str,"rb+");
    if(file==NULL) {print(">>Open error!Please Check whether the file exist or not!",0);return;}
    fread(&_stu_num,sizeof(int),1,file);
    for(i=0;i<_stu_num;i++)
        fread(&stu[i],sizeof(Stu),1,file);
    print(">>Open success!",0);
}
void list_by_name(Stu *stu,int _stu_num)
{
    int i,count=0;
    char name[255];
    scanf("%s",name);
    printf("     Stu_id:     Name:     C:     English:/n");
    for(i=0;i<_stu_num;i++)
        if(strcmp(stu[i]._stu_name.str,name)==0)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
    printf(">>total %d student(s) found!/n",count);
}
void list_by_id(Stu *stu,int _stu_num)
{
    int i,count=0;
    char name[255];
    scanf("%s",name);
    printf("     Stu_id:     Name:     C:     English:/n");
    for(i=0;i<_stu_num;i++)
        if(strcmp(stu[i]._stu_num.str,name)==0)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
    printf(">>total %d student(s) found!/n",count);
}
void list_by_cs(Stu *stu,int _stu_num)
{
    int i,count=0,base;
    char name[255];
    scanf("%s%d",name,base);
    printf("     Stu_id:     Name:     C:     English:/n");
    for(i=0;i<_stu_num;i++)
    {
        if(strcmp(name,"==")==0&base==stu[i]._stu_c_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,"<=")==0&base>=stu[i]._stu_c_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,">=")==0&base<=stu[i]._stu_c_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,">")==0&base<stu[i]._stu_c_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,"<")==0&base>stu[i]._stu_c_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
    }
    printf(">>total %d student(s) found!/n",count);
}
void list_by_es(Stu *stu,int _stu_num)
{
    int i,count=0,base;
    char name[255];
    scanf("%s%d",name,base);
    printf("     Stu_id:     Name:     C:     English:/n");
    for(i=0;i<_stu_num;i++)
    {
        if(strcmp(name,"==")==0&base==stu[i]._stu_eng_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,"<=")==0&base>=stu[i]._stu_eng_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,">=")==0&base<=stu[i]._stu_eng_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,">")==0&base<stu[i]._stu_eng_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
        if(strcmp(name,"<")==0&base>stu[i]._stu_eng_score)
            count++,printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
    }
    printf(">>total %d student(s) found!/n",count);
}
int find(Stu *stu,int _stu_num,char* id)
{
    int i;
    for(i=0;i<_stu_num;i++)if(strcmp(stu[i]._stu_num.str,id)==0)return i;
    print(">>Can't find the infomation!Please Check your order carefully!",0);
    return 0;
}
void showhelp()
{
    print(">>Here follows some tips:",0);
    print("help:show some tips.",0);
    print("open [dir_name]:load stu_info from the file.",0);
    print("save:save all data,but you must ensure you have open a file.",0);
    print("asave [dir_name]:save all data to [dir_name].",0);
    print("update [stu_id] [option] [value]:[stu_id] means the unique id one student has,[option] means the name,c_score or english_score,while [value] means change the [option] to [value].",0);
    print("find [option]:[option] [<,>,==,>=,<=] [value] means stu_id,name,c_score or english_score,find all that fit the [value]",0);
    print("add [stu_id] [stu_name] [c_score] [english_score]:add a new record.",0);
    print("del [stu_id]:delete the record at [stu_id].",0); 
    cin();
}
void showall(Stu *stu,int _stu_num)
{
    int i;
    printf("     Stu_id:     Name:     C:     English:/n");
    for(i=0;i<_stu_num;i++)
        printf("%12s%10s%7d%13d/n",stu[i]._stu_num.str,stu[i]._stu_name.str,stu[i]._stu_c_score,stu[i]._stu_eng_score);
    printf(">>total %d student(s) found!/n",_stu_num);
}
Stu stu[MAX_STU_NUM+1];
String order,url;
char way[255],tmp[255];
int _stu_num=0,id,tcl;
void main()
{
    print("Welcome to the Stu_Info_System!",20);
    showhelp();
    file=NULL;
    while(scanf("%s",&order.str)!=EOF,strcmp(order.str,QUIT))
        {
            change(order.str);
            if(strcmp(order.str,ADD_STU_INFO)==0)
                {
                    add(stu,_stu_num);
                    sort(stu,_stu_num);
                    cin();
                    continue;
                }
            if(strcmp(order.str,DEL_STU_INFO)==0)
                {
                    del(stu,_stu_num);
                    sort(stu,_stu_num);
                    cin();
                    continue;
                }
            if(strcmp(order.str,OPEN_FILE)==0)
                {
                    scanf("%s",url.str);
                    open(stu,url,_stu_num);
                    sort(stu,_stu_num);
                    cin();
                    continue;
                }
            if(strcmp(order.str,UP_STU_INFO)==0)
                {
                    scanf("%s %s",tmp,way);
                    if(strcmp(way,"name")==0)
                    {id=-1;
                        id=find(stu,_stu_num,tmp);
                        scanf("%s",&tmp);
                        if(id!=-1)strcpy(stu[id]._stu_name.str,tmp);
                    }
                    if(strcmp(way,"cscore")==0)
                    {id=-1;
                        id=find(stu,_stu_num,tmp);
                        scanf("%d",&tcl);
                        if(id!=-1)stu[id]._stu_c_score=tcl;
                    }
                    if(strcmp(way,"escore")==0)
                    {id=-1;
                        id=find(stu,_stu_num,tmp);
                        scanf("%d",&tcl);
                        if(id!=-1)stu[id]._stu_eng_score=tcl;
                    }
                    cin();
                    continue;
                }
            if(strcmp(order.str,FIN_STU_INFO)==0)
                {
                    scanf("%s",way);
                    if(strcmp(way,"name")==0)
                        {
                            list_by_name(stu,_stu_num);
                            cin();
                            continue;
                        }
                    if(strcmp(way,"id")==0)
                        {
                            list_by_id(stu,_stu_num);
                            cin();
                            continue;
                        }
                    if(strcmp(way,"cscore")==0)
                        {
                            list_by_cs(stu,_stu_num);
                            cin();
                            continue;
                        }
                    if(strcmp(way,"escore")==0)
                        {
                            list_by_es(stu,_stu_num);
                            cin();
                            continue;
                        }
                }
            if(strcmp(order.str,SAVE_FILE)==0)
                {
                        save(stu,_stu_num);
                        cin();
                        continue;
                }
            if(strcmp(order.str,OTH_SAVE_FILE)==0)
                {
                    scanf("%s",&url.str);
                    asave(stu,_stu_num,url);
                    cin();
                    continue;
                }
            if(strcmp(order.str,HELP)==0)
                {
                    showhelp();
                    continue;
                }
            if(strcmp(order.str,SHOW_ALL)==0)
                {
                    showall(stu,_stu_num);
                    cin();
                    continue;
                }
            printf(">>type [help] to find more available orders!/n");
            cin();
        }
}