如何用C语言代码实现商品管理系统开发

这篇文章主要讲解了“如何用C语言代码实现商品管理系统开发”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“如何用C语言代码实现商品管理系统开发”吧！

程序介绍

商品管理系统主要是对商品的基本信息进行增、删、改、查以及商品的插入的操作，以便用户可以快速地对这些信息进行管理。

操作流程

用户在编译完成后会产生一个系统的可执行文件，用户只要双击可执行文件就可以进入系统，如图所示，用户根据自己需要的操作选择相应的功能。

代码

#include<stdio.h>#include<stdlib.h>#include<conio.h>#include<dos.h>#include<string.h>#define LEN sizeof(struct commdity)#define FORMAT "%-8d%-15s%-12.1lf%-12.1lf%-12.1lf\n"#define DATA comm[i].num,comm[i].name,comm[i].price,comm[i].count,comm[i].totalstruct commdity/*定义商品信息结构体*/{     int num;/*编号*/    char name[15];/*商品名称*/    double price;/*单价*/    double count;/*数量*/    double total;/*总金额*/};struct commdity comm[50];/*定义结构体数组*/void in();/*录入商品信息*/void show();/*显示商品信息*/void order();/*按总金额排序*/void del();/*删除商品信息*/void modify();/*修改商品息*/void menu();/*主菜单*/void insert();/*插入商品信息*/void total();/*计算总商品数*/void search();/*查找商品信息*//** * 主 函 数*/int main(int argc,char *argv[]){     system("color f0\n");    //白底黑字    int n = 0;    menu();    scanf("%d",&n);/*输入选择功能的编号*/    while(n)    {         switch(n)        {        case 1:             in();    /*调用录入商品信息过程*/            break;        case 2:             search();   /*查找商品信息过程*/            break;        case 3:             del();     /*调用删除商品信息的过程*/            break;        case 4:            modify();   /*调用修改商品信息的过程*/            break;        case 5:            insert();   /*调用插入数据的过程*/            break;        case 6:            order();   /*调用排序过程*/            break;        case 7:            total();   /*计算总数*/            break;        default:break;        }        getch();        menu();   /*执行完功能再次显示菜单界面*/        scanf("%d",&n);    }    return 0; }void in()/*录入商品信息*/{     int i,m=0;/*m是记录的条数*/    char ch[2];    FILE *fp;/*定义文件指针*/    if((fp=fopen("data","ab+"))==NULL)/*打开指定文件*/    {         printf("不能打开文件!\n");        return;    }    while(!feof(fp))     {         if(fread(&comm[m] ,LEN,1,fp)==1)            m++;/*统计当前记录条数*/    }    fclose(fp);    if(m==0)         printf("没有找到!\n");    else     {        system("cls");        show();/*调用show函数，显示原有信息*/    }    if((fp=fopen("data","wb"))==NULL)    {         printf("不能打开文件!\n");        return;    }    for(i=0;i<m;i++)         fwrite(&comm[i] ,LEN,1,fp);/*向指定的磁盘文件写入信息*/    printf("是否输入?(y/n):");    scanf("%s",ch);    while(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)/*判断是否要录入新信息*/    {        printf("编号:");        scanf("%d",&comm[m].num);/*输入学生学号*/        for(i=0;i<m;i++)            if(comm[i].num == comm[m].num)            {                printf("该记录已经存在，按任意键继续!");                getch();                fclose(fp);                return;            }            printf("商品名:");            scanf("%s",comm[m].name);   /*输入学生姓名*/            printf("单价:");            scanf("%lf",&comm[m].price);   /*输入商品单价*/            printf("数量:");            scanf("%lf",&comm[m].count);   /*输入商品数量*/            comm[m].total=comm[m].price * comm[m].count;  /*计算出总金额*/            if(fwrite(&comm[m],LEN,1,fp)!=1)  /*将新录入的信息写入指定的磁盘文件*/            {                printf("不能保存!");                 getch();             }            else            {                 printf("%s 已经保存!\n",comm[m].name);                m++;            }            printf("是否继续?(y/n):");/*询问是否继续*/            scanf("%s",ch);    }    fclose(fp);    printf("OK!\n");}void show()     /*显示商品信息*/{    FILE *fp;    int i,m=0;    fp=fopen("data","ab+");    while(!feof(fp))    {        if(fread(&comm[m] ,LEN,1,fp)==1)             m++;    }      fclose(fp);    printf("编号   商品名称       单价         数量       总金额\t\n");    for(i=0;i<m;i++)    {         printf(FORMAT,DATA);/*将信息按指定格式打印*/    }}void menu()           /*自定义函数实现菜单功能*/{    system("cls");    printf("\n\n\n\n\n");    printf("\t\t|-------------------商品管理系统-----------------|\n");    printf("\t\t|\t\t\t\t\t\t |\n");    printf("\t\t|\t\t   1. 录入记录                   |\n");    printf("\t\t|\t\t   2. 查找记录                   |\n");    printf("\t\t|\t\t   3. 删除记录                   |\n");    printf("\t\t|\t\t   4. 修改记录                   |\n");    printf("\t\t|\t\t   5. 插入记录                   |\n");    printf("\t\t|\t\t   6. 排序记录                   |\n");    printf("\t\t|\t\t   7. 统计记录                   |\n");    printf("\t\t|\t\t   0. 退出                       |\n");    printf("\t\t|\t\t\t\t\t\t |\n");    printf("\t\t|------------------------------------------------|\n\n");    printf("\t\t\t选择(0-7):");}void order()    /*自定义排序函数*/{     FILE *fp;    struct commdity t;    int i=0,j=0,m=0;    if((fp=fopen("data","ab+"))==NULL)    {         printf("不能打开文件!\n");        return;    }    while(!feof(fp))         if(fread(&comm[m] ,LEN,1,fp)==1)             m++;        fclose(fp);        if(m==0)         {            printf("没有记录!\n");            return;        }        for(i=0;i<m-1;i++)            for(j=i+1;j<m;j++)   /*双重循环实现总金额比较并交换*/                if(comm[i].total < comm[j].total)                {                     t=comm[i];                    comm[i]=comm[j];                    comm[j]=t;                }                if((fp=fopen("data","wb"))==NULL)                {                     printf("不能打开\n");                    return;                }                for(i=0;i<m;i++)/*将重新排好序的内容重新写入指定的磁盘文件中*/                    if(fwrite(&comm[i] ,LEN,1,fp)!=1)                    {                         printf("%s 不能保存!\n");                         getch();                    }                    fclose(fp);                    printf("保存成功\n");}/*自定义删除函数*/void del()                                                    {    FILE *fp;    int snum,i,j,m=0;    char ch[2];    if((fp=fopen("data","ab+"))==NULL)    {         printf("不能打开文件\n");        return;    }    while(!feof(fp))          if(fread(&comm[m],LEN,1,fp)==1)             m++;        fclose(fp);        if(m==0)         {            printf("没有记录!\n");            return;        }        printf("请输入编号:");        scanf("%d",&snum);        for(i=0;i<m;i++)            if(snum==comm[i].num)                break;            if(i==m)            {                printf("没有找到!");                getchar();                return;            }            printf("已经找到该记录，是否删除?(y/n)");            scanf("%s",ch);            if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)            /*判断是否要进行删除*/            {                for(j=i;j<m;j++)                    comm[j] = comm[j+1];                /*将后一个记录移到前一个记录的位置*/                m--;                                        /*记录的总个数减1*/                printf("成功删除!\n");            }            if((fp=fopen("data","wb"))==NULL)            {                 printf("不能打开!\n");                return;            }            for(j=0;j<m;j++)                                /*将更改后的记录重新写入指定的磁盘文件中*/                if(fwrite(&comm[j] ,LEN,1,fp)!=1)                {                     printf("不能保存!\n");                    getch();                }                fclose(fp);                }void search()/*自定义查找函数*/{     FILE *fp;    int snum,i,m=0;    char ch[2];    if((fp=fopen("data","ab+"))==NULL)    {         printf("不能打开文件\n");        return;    }        if(fread(&comm[m],LEN,1,fp)==1)         {            m++;        }        fclose(fp);        if(m==0)        {            printf("没有记录!\n");            return;        }        printf("请输入编号:");        scanf("%d",&snum);        for(i=0;i<=m;i++)        {            if(snum == comm[i].num)/*查找输入的编号是否在记录中*/            {                 printf("已经找到该记录，是否显示?(y/n)");                scanf("%s",ch);                if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)                 {                    printf("编号   商品名称        单价       数量         总金额 \t\n");                    printf(FORMAT,DATA);/*将查找出的结果按指定格式输出*/                    break;                }                else                {                      return;                }            }              else                {                    printf("没有这条记录!\n");                    return;                }        }          }void modify()/*自定义修改函数*/{     FILE *fp;    int i,j,m=0,snum;        char ch[2];    if((fp=fopen("data","ab+"))==NULL)    {         printf("不能打开文件!\n");        return;    }        if(fread(&comm[m],LEN,1,fp)==1)         {            m++;        }        if(m==0)        {            printf("没有记录!\n");            fclose(fp);            return;        }        printf("请输入要修改的记录信息的编号!\n");        scanf("%d",&snum);        for(i=0;i<m;i++)                    if(snum==comm[i].num)/*检索记录中是否有要修改的信息*/            {                break;            }                    if(i<m)            {                    printf("已经找到该记录，是否修改?(y/n)\n");                scanf("%s",ch);                if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)                      {                    printf("商品名:\n");                    scanf("%s",comm[i].name);/*输入名字*/                    printf("\n单价:");                    scanf("%lf",&comm[i].price);/*输入商品单价*/                    printf("\n数量:");                    scanf("%lf",&comm[i].count);/*输入商品数量*/                    comm[i].total = comm[i].price  * comm[i].count;                    printf("保存成功!");                }                else                {                    return;                }            }            else             {                printf("没有找到!");                getchar();                return;            }            if((fp=fopen("data","wb"))==NULL)            {                printf("不能打开文件!\n");                return;            }            for(j=0;j<m;j++)/*将新修改的信息写入指定的磁盘文件中*/            {                if(fwrite(&comm[j] ,LEN,1,fp)!=1)                {                     printf("不能保存!");                     getch();                 }            }            fclose(fp);}void insert()                                            /*自定义插入函数*/{     FILE *fp;    int i,j,k,m=0,snum;    if((fp=fopen("data","ab+"))==NULL)    {         printf("不能打开文件!\n");        return;    }    while(!feof(fp))          if(fread(&comm[m],LEN,1,fp)==1)            m++;        if(m==0)         {            printf("没有记录!\n");            fclose(fp);            return;        }        printf("请输入要插入记录的位置!\n");        scanf("%d",&snum);                            /*输入要插入的位置*/        for(i=0;i<m;i++)            if(snum == comm[i].num)                break;            for(j=m-1;j>i;j--)                comm[j+1] = comm[j];                    /*从最后一条记录开始均向后移一位*/            printf("now please input the new information.\n");            printf("编号:");            scanf("%d",&comm[i+1].num);            for(k=0;k<m;k++)                if(comm[k].num == comm[i+1].num&&k!=i+1)                {                    printf("该编号已经存在，按任意键继续!");                    getch();                    fclose(fp);                    return;                }                printf("商品名:\n");                scanf("%s",comm[i+1].name);                printf("\n单价:");                scanf("%lf",&comm[i+1].price);                printf("\n数量:");                scanf("%lf",&comm[i+1].count);                comm[i+1].total = comm[i+1].price  * comm[i+1].count ;                if((fp=fopen("data","wb"))==NULL)                {                     printf("不能打开文件!\n");                    return;                }                for(k=0;k<=m;k++)                    if(fwrite(&comm[k] ,LEN,1,fp)!=1)        /*将修改后的记录写入磁盘文件中*/                    {                        printf("不能保存!");                         getch();                     }                    fclose(fp);}void total()    /* 统计*/{     FILE *fp;    int m=0;    if((fp=fopen("data","ab+"))==NULL)    {                 printf("不能打开记录!\n");        return;    }    while(!feof(fp))          if(fread(&comm[m],LEN,1,fp)==1)             m++;/*统计记录个数即记录个数*/        if(m==0)        {            printf("没有记录!\n");            fclose(fp);            return;        }        printf("一共有 %d 条记录!\n",m);/*将统计的个数输出*/        fclose(fp);}

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