（C语言代码分享）：车辆信息管理系统源代码来了。

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct vehicle
{
  int num;
  char tpy[20];
  char ppai[30];
  char chepai[20];
  char gongsi[30];
  struct vehicle *next;
};
int n;
struct vehicle *w;
int main()
{
  struct vehicle *start(); //初始化信息 
  void print(struct vehicle *h); //输出函数 
  void log(); //登录界面
  void user();//用户登录
  void control();//管理员登录
  struct vehicle *refers(struct vehicle *h);//按编码查询 
  struct vehicle *VEH(struct vehicle *h);//按车型查询 
  void adds();//插入全操作 
  void dels();//删除全操作 
  struct vehicle *change(struct vehicle *h);//更改操作 
  struct vehicle *head; //定义结构体类型变量 
  int inp1,inp2,inp3;
  head=start(); //暂存初始信息 
A:  log();
  scanf("%d",&inp1);
  if(inp1==1)
  {
    user();
    scanf("%d",&inp2);  
    switch(inp2)
    {
      case 1:print(head);goto A;break;
      case 2:refers(w);goto A;break;
      case 3:VEH(w);goto A;break;
      default:break;
    }
  } 
  if(inp1==2)
  {
    control();
    scanf("%d",&inp3);
    switch(inp3)
    {
      case 1:adds();goto A;break;
      case 2:dels();goto A;break;
      case 3:change(w);goto A;break;
      default:break;
    }
  }
  if(inp1==3)
  {
    printf("\n\n你已退出！欢迎使用！");
  }
  return 0;
}
struct vehicle *start() //初始化信息函数 
{
  struct vehicle *a1,*a2,*b1,*b2,*c1,*c2;
  a1=(struct vehicle *)malloc(sizeof(struct vehicle));
  a1->num = 10201;strcpy(a1->tpy,"轿车");strcpy(a1->ppai,"宝马sss");
  strcpy(a1->chepai,"川B28393");strcpy(a1->gongsi,"宝马有限公司"); 
  a2=(struct vehicle *)malloc(sizeof(struct vehicle));
  a2->num = 10203;strcpy(a2->tpy,"轿车");strcpy(a2->ppai,"奔驰s");
  strcpy(a2->chepai,"川B23849");strcpy(a2->gongsi,"奔驰有限公司");
  b1=(struct vehicle *)malloc(sizeof(struct vehicle));
  b1->num = 10204;strcpy(b1->tpy,"客车");strcpy(b1->ppai,"金杯tpy");
  strcpy(b1->chepai,"川B24799");strcpy(b1->gongsi,"金杯有限公司");
  b2=(struct vehicle *)malloc(sizeof(struct vehicle));
  b2->num = 10206;strcpy(b2->tpy,"客车");strcpy(b2->ppai,"宇通tpy");
  strcpy(b2->chepai,"川B93889");strcpy(b2->gongsi,"宇通有限公司");
  c1=(struct vehicle *)malloc(sizeof(struct vehicle));
  c1->num = 10208;strcpy(c1->tpy,"货车");strcpy(c1->ppai,"东风t");
  strcpy(c1->chepai,"川B62834");strcpy(c1->gongsi,"东风有限公司");
  c2=(struct vehicle *)malloc(sizeof(struct vehicle));
  c2->num = 10211;strcpy(c2->tpy,"货车");strcpy(c2->ppai,"解放t");
  strcpy(c2->chepai,"川B24793");strcpy(c2->gongsi,"解放有限公司");
  w=a1;
  a1->next = a2;
  a2->next = b1;
  b1->next = b2;
  b2->next = c1;
  c1->next = c2;
  c2->next = NULL;
  return w;
}
void log() //登录界面 
{
  printf("\n\n\t******车辆信息管理系统*****");
  printf("\n\t\t1、用户登录");
  printf("\n\t\t2、管理员登录");
  printf("\n\t\t3、退出登录"); 
  printf("\n\n请输入你的操作：");
}
void user() //用户登录 
{
  printf("\n\n\t*********用户登录**********");
  printf("\n\t\t1、显示信息库");
  printf("\n\t\t2、按编号查询");
  printf("\n\t\t3、按类别查询");
  printf("\n\n请输入你的操作："); 
} 
void control() //管理员登录 
{
  printf("\n\n\t********管理员登录**********");
  printf("\n\t\t1、添加车辆信息");
  printf("\n\t\t2、删除车辆信息");
  printf("\n\t\t3、更改车辆信息");
  printf("\n\n请输入你的操作：");
}
struct vehicle *refers(struct vehicle *h)//按编码查询 
{
  struct vehicle *p1,*p2,*p0;
  p2=p1=h;
  int num;
  int ch;
  p0=NULL;
  while(1)
  {
    printf("\n是否需要查询(Y/N): ");
    do{
      ch=getchar(); 
    } while(ch!='Y' && ch!='N');
    if(ch=='Y')
    {
      printf("\n请输入要查询的编号：");
      scanf("%d",&num); 
      while(p1->num!=num && p1->next!=NULL) 
      {
        p2=p1;
        p1=p1->next;
      }
      if(p1->num == num)
      {
        p0=p1;
        printf("\n车辆信息为：");
        printf("\n编码\t车型\t品牌\t\t车牌\t\t公司");
        printf("\n%d\t%s\t%s\t\t%s\t%s",p0->num,p0->tpy,p0->ppai,p0->chepai,p0->gongsi);
      }
      else{
        printf("\n未找到相关数据！");
      }
    }
    else{
      printf("\n查询完毕!你已退出！");
      break;
    }
  }
  return h;
}
struct vehicle *VEH(struct vehicle *h)//按车型查询 
{
  struct vehicle *p1,*p2;
  p2=p1=h;
  int retu,ch;
  while(1)
  {
    printf("\n是否需要查询(Y/N): ");
    do{
      ch=getchar(); 
    } while(ch!='Y' && ch!='N');
    if(ch=='Y')
    {
      char a[30];
      printf("\n请输入车型：");
      scanf("%s",&a);
      printf("\n车辆信息为：");
      printf("\n编码\t车型\t品牌\t\t车牌\t\t公司");
      p1=p2;
      while(1)
      {   
        retu=strcmp(a,p1->tpy);
        if(retu==0)
        {
          printf("\n%d\t%s\t%s\t\t%s\t%s",p1->num,p1->tpy,p1->ppai,p1->chepai,p1->gongsi);
        }
        if(p1->next==NULL)
        {
          break;
        } 
        p1=p1->next;
      }
    }
    else{
      printf("\n查询完毕！");
      break;
    } 
  }
  return h;
} 
void adds()//插入全操作 
{
  struct vehicle *add(struct vehicle *h,int num,char tpy[20],char ppai[30],char chepai[20],char gongsi[30]);
  void print(struct vehicle *h);
  int num;
  char tpy[20];
  char ppai[30];
  char chepai[20];
  char gongsi[30];
  int ch;
  while(1)
  {
    printf("\n是否需要添加(Y/N)：");
    do{
      ch=getchar();
    }while(ch!='Y' && ch!='N');
    if(ch=='Y')
    {
      printf("\n请输入编码、车型、品牌、车牌、公司：");
      scanf("\n%d%s%s%s%s",&num,&tpy,&ppai,&chepai,&gongsi);
      w=add(w,num,tpy,ppai,chepai,gongsi);
    }else{
      printf("\n添加结束！");
      break;
    }
  }
  printf("你已退出！");
  print(w);
}
struct vehicle *add(struct vehicle *h,int num,char tpy[20],char ppai[30],char chepai[20],char gongsi[30])//插入关键
{
  struct vehicle *p1,*p2,*p0;
  p1=h;
  p2=NULL;
  while(p1!=NULL && p1->num<num) 
  {
    p2=p1;
    p1=p1->next;
  }
  p0=(struct vehicle *)malloc(sizeof(struct vehicle));
  p0->num = num;
  strcpy(p0->tpy,tpy);
  strcpy(p0->ppai,ppai);
  strcpy(p0->chepai,chepai);
  strcpy(p0->gongsi,gongsi);
  p0->next=p1;
  if(p2==NULL)
  {
    h=p0; 
  }else{
    p2->next=p0;
  }
  return h; 
} 
void dels()//删除全操作
{
  struct vehicle *del(struct vehicle *h,int num);
  void print(struct vehicle *h);
  int num;
  int ch;
  while(1)
  {
    printf("\n是否需要删除(Y/N): ");
    do{
      ch=getchar(); 
    } while(ch!='Y' && ch!='N');
    if(ch=='Y')
    {
      printf("\n请输入要删除的编号：");
      scanf("%d",&num);
      w=del(w,num);
    }
    else{
      printf("\n删除完毕！");
      break;
    } 
  }
  printf("你已退出！");
  print(w);
} 
struct vehicle *del(struct vehicle *h,int num)//删除操作 
{
  struct vehicle *p1,*p2;
  p1=p2=h;
  while(p1->next!=NULL && p1->num!=num)
  {
    p2=p1;
    p1=p1->next;
  }
  if(p1->num == num)
  {
    if(p1==h)
    {
      h=p1->next;
    }
    else{
      p2->next=p1->next;
    }
  }
  else{
    printf("\n未找到相关数据！");
  }
  return h;
}
struct vehicle *change(struct vehicle *h)//更改操作 
{
  struct vehicle *cas1(struct vehicle *h1);
  struct vehicle *cas2(struct vehicle *h1);
  struct vehicle *cas3(struct vehicle *h1);
  struct vehicle *cas4(struct vehicle *h1);
  struct vehicle *cas5(struct vehicle *h1);
  void print1(struct vehicle *h1);
  struct vehicle *p1,*p2,*p0;
  p2=p1=h;
  int num;
  int ch,input;
  p0=NULL;
  while(1)
  {
    printf("\n是否需要更改(Y/N): ");
    do{
      ch=getchar(); 
    } while(ch!='Y' && ch!='N');
    if(ch=='Y')
    {
      printf("\n请输入要更改的编号：");
      scanf("%d",&num); 
      while(p1->num!=num && p1->next!=NULL) 
      {
        p2=p1;
        p1=p1->next;
      }
      if(p1->num == num)
      {
        p0=p1;
        printf("\n编码\t车型\t品牌\t\t车牌\t\t公司");
        printf("\n%d\t%s\t%s\t\t%s\t%s",p0->num,p0->tpy,p0->ppai,p0->chepai,p0->gongsi);
        printf("\n*************执行操作******************"); 
        printf("\n1、编码 2、车型 3、品牌 4、车牌 5、公司");
        printf("\n请输入你的操作：");
        scanf("%d",&input); 
        switch(input)
        {
          case 1:p0=cas1(p0);print1(p0); break;
          case 2:p0=cas2(p0);print1(p0); break;
          case 3:p0=cas3(p0);print1(p0); break;
          case 4:p0=cas4(p0);print1(p0); break;
          case 5:p0=cas5(p0);print1(p0); break;
          default:printf("输入错误！");break; 
        }
      }
      else{
        printf("\n未找到相关数据！");
      }
    }
    else{
      printf("\n更改完毕!你已退出！");
      break;
    }
  }
  return h;
} 
struct vehicle *cas1(struct vehicle *h1)//编码更改 
{
  struct vehicle *p;
  p=h1;
  printf("请输入新的编号：");
  scanf("%d",&p->num );
  return p;
}
struct vehicle *cas2(struct vehicle *h1)//车型更改 
{
  struct vehicle *p;
  p=h1;
  char a[30];
  printf("请输入新的车型：");
  scanf("%s",&a);
  strcpy(p->tpy,a);
  return p;
}
struct vehicle *cas3(struct vehicle *h1)//品牌更改 
{
  struct vehicle *p;
  p=h1;
  char a[30];
  printf("请输入新的品牌：");
  scanf("%s",&a);
  strcpy(p->ppai,a);
  return p;
}
struct vehicle *cas4(struct vehicle *h1)//车牌更改 
{
  struct vehicle *p;
  p=h1;
  char a[30];
  printf("请输入新的车牌：");
  scanf("%s",&a);
  strcpy(p->chepai,a);
  return p;
}
struct vehicle *cas5(struct vehicle *h1)//公司更改 
{
  struct vehicle *p;
  p=h1;
  char a[30];
  printf("请输入新的公司：");
  scanf("%s",&a);
  strcpy(p->gongsi,a);
  return p;
}
void print1(struct vehicle *h1) //单个输出 
{
  struct vehicle *p;
  p=h1;
  printf("\n已更改！信息为：");
  printf("\n编码\t车型\t品牌\t\t车牌\t\t公司");
  printf("\n%d\t%s\t%s\t\t%s\t%s",p->num,p->tpy,p->ppai,p->chepai,p->gongsi); 
}
void print(struct vehicle *h) //输出函数 
{
  struct vehicle *p;
  p=h;
  if(h!=NULL)
  {
    printf("\n车辆信息为：");
    printf("\n编码\t车型\t品牌\t\t车牌\t\t公司");
    do{
      printf("\n%d\t%s\t%s\t\t%s\t%s",p->num,p->tpy,p->ppai,p->chepai,p->gongsi);
      p=p->next;
    }while(p!=NULL);
  }
}