（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);
	}
}