图书管理系统！

直接上代码：

头文件

typedef struct book{

char*name;

int id;

int count;

int status;

structbook *next;

Book *head = NULL;

intnbook =0;

int main(){

welcome();

return0;

}void welcome(){

printf("*************************欢迎使用图书管理系统*************************\n");

while(1){

printf("-------------------------------------\n");

printf("请输入项目前编号执行相关操作：\n");

printf("\n[1] 管理员入口\n\n[2] 学生入口\n\n[0] 退出\n\n");

switch(land()){

case'1':

while(1){

if(usrmanager()){

continue;

}else{

break;

}

}

break;

case'2':

while(1){

if(usrstudent()){

continue;

}else{

break;

}

}

break;

case'0':

exit(0);

default:

error("采集项目参数失败");

}

}

}char land(){

char c, flag;

int i;

while(1){

for(i =0; (c = getchar()) !='\n'; flag = c, ++i)

;

if(i ==1){

if(flag =='1'|| flag =='2'|| flag =='0'){

return flag;

}

}elseif(i ==0){

continue;

}

error("[请输入命令：1 / 2 / 0 选择项目]");

}

return'\0';

}voiderror(char*s){

fprintf(stderr, "%s\n", s);

}char dostudent(){

char c, flag;

int i;

while(1){

for(i =0; (c = getchar()) !='\n'; flag = c, ++i )

;

if(i ==1){

if(flag =='1'|| flag =='2'|| flag =='3'|| flag =='0'){

return flag;

}

}elseif(i ==0){

continue;

}

error("[请输入命令：1 / 2 / 3/ 0 选择项目]");

}

}int usrstudent(){

printf("-------------------------------------\n");

printf("请输入项目前编号执行相关操作：\n\n");

printf("[1] 借阅图书\n[2] 归还图书\n[3] 查看馆存图书\n");

printf("[0] 返回主页\n");

switch(dostudent()){

case'1':

borrowbook();

break;

case'2':

returnbook();

break;

case'3':

viewbook();

break;

case'0':

return0;

default:

error("采集项目参数失败");

break;

}

return1;

}int borrowbook(){

system(CLEAR);

char sname[MAXNAME];

printf("搜索图书:\n");

scanf("%s", sname);

getchar();

Book *bp;

char*namep = NULL;

if((bp = lookup(namep = strdup(sname),0)) == NULL){

printf("图书 %s 不存在\n", namep);

fflush(stdin);

return-1;

}else{

printbook(bp);

if(! bp->status){

printf("借阅图书：Y N\n");

}else{

printf("图书外借中\n");

return0;

}

while(1){

charc ='\0';

scanf("%c", &c);

getchar();

if(!(c =='Y'|| c =='y'|| c =='N'|| c =='n')){

fflush(stdin);

error("指令无效");

continue;

}

if(c =='Y'|| c =='y'){

--bp->count > -1? printf("成功\n") : printf("失败\n");

if(! bp->count){

bp->status = UNAVAILABLE;

}

returnbp->id;

}else{

return0;

}

}

}

return-1;

}int returnbook(){

system(CLEAR);

char sname[MAXNAME];

printf("归还图书：\n");

scanf("%s", sname);

getchar();

Book *bp;

char*namep;

if((bp = lookup(namep = strdup(sname),0)) == NULL){

fflush(stdin);

printf("此图书并不是馆内图书\n");

return-1;

}else{

printbook(bp);

printf("归还图书：Y N\n");

while(1){

charc ='\0';

scanf("%c", &c);

getchar();

if(!(c =='Y'|| c =='y'|| c =='N'|| c =='n')){

fflush(stdin);

error("指令无效");

}elseif(c =='Y'|| c =='y'){

bp->count++ ? : (bp->status = AVAILABLE);

printf("成功\n");

returnbp->id;

}else{

return0;

}

}

}

return-1;

}char domanager(){

char c, flag;

int i;

while(1){

for(i =0; (c = getchar()) !='\n'; flag = c, ++i)

;

if(i ==1){

if(flag =='1'|| flag =='2'|| flag =='3'|| flag =='4'|| flag =='0'){

return flag;

}

}elseif(i ==0){

continue;

}

error("[请输入命令：1 / 2 / 3/ 4 / 0 选择项目]");

}

return'\0';

}int usrmanager(){

printf("-------------------------------------\n");

printf("请输入项目前编号执行相关操作：\n\n");

printf("[1] 查看已存图书\n[2] 注册新图书\n[3] 修改已有图书信息\n[4] 注销现存图书\n");

printf("[0] 返回主页\n");

switch(domanager()){

case'1':

viewbook();

break;

case'2':

addbook();

break;

case'3':

modbook();

break;

case'4':

delbook();

break;

case'0':

return0;

default:

error("采集项目参数失败");

break;

}

return1;

}int viewbook(){

system(CLEAR); ///////////////////////////////////////////Book *bp;

for(bp =head; bp != NULL; bp = bp->next){

printbook(bp);

}

if(nbook){

return nbook;

}else{

printf("图书馆还没有图书哦\n");

return0;

}

return-1;

}voidprintbook(Book *bp){

printf("图书编号：%d\n", bp->id);

printf("图书名：%s\n", bp->name);

printf("图书存数：%d\n", bp->count);

printf("图书状态：%s\n", bp->status ?"不可借":"可借");

}int addbook(){

system(CLEAR); ///////////////////////////////////////////char sname[MAXNAME];

int id, count;

char*namep;

while(1){

id =0;

count =0;

namep = NULL;

printf("请输入图书名：\n");

scanf("%s", sname);

getchar();

printf("请输入小于1000的图书编号：\n");

scanf("%d", &id);

getchar();

if(!(id >0&& id

error("输入编号不符合要求");

fflush(stdin);

continue;

}

printf("请输入小于50的图书数量：\n");

scanf("%d", &count);

getchar();

if(!(count >0&& count

error("输入数目不符合要求");

fflush(stdin);

continue;

}

Book *bp;

if((bp = lookup(namep = strdup(sname), id)) == NULL){

bp = (Book *)malloc(sizeof (Book));

if(bp == NULL || (bp->name = namep) == NULL){

error("注册图书失败");

fflush(stdin);

continue;

}

bp->id = id;

bp->count = count;

bp->status = AVAILABLE;

++nbook;

bp->next = head;

head = bp;

printf("图书 %s 注册成功\n", sname);

return id;

}else{

fflush(stdin);

error("图书名或编号已经被占用");

}

}

return-1;

}

Book *lookup(char*s,int id){

Book *bp;

for(bp = head; bp != NULL; bp = bp->next){

if(id == bp->id || strcmp(s, bp->name) ==0){

return bp;

}

}

return NULL;

}intmodbook(){// 修改除id之外的信息 因为要修改id 直接删掉后重新添加会更好system(CLEAR);///////////////////////////////////////////Book *bp = NULL;

while(1){

intid =0;

printf("请输入要修改信息的图书编号：\n");

scanf("%d", &id);

getchar();

if(!(id >0&& id

fflush(stdin);

error("图书编号不符合要求");

continue;

}

if((bp = lookup("", id)) != NULL){

printf("以下为要修改的图书的现有信息：\n");

printbook(bp);

printf("[1] 修改图书名\n[2] 修改图书数量\n[3] 修改图书状态\n[0] 放弃修改\n");

while(1){

int i;

scanf("%d", &i);

getchar();

if(!(i ==1|| i ==2|| i ==3|| i ==0)){

fflush(stdin);

error("输入项目前编号选择相关项目");

continue;

}

switch(i){

case1:

while(1){

charnewname[MAXNAME], *namep;

printf("图书名：\n");

scanf("%s", newname);

getchar();

if((lookup(namep = strdup(newname),0)) != NULL){

fflush(stdin);

error("图书名已存在");

continue;

}

if((bp->name = namep) != NULL){

printf("修改成功\n");

return id;

}

}

break;

case2:

while(1){

int bnum;

printf("输入图书数量：\n");

scanf("%d", &bnum);

getchar();

if(!(bnum >0|| bnum

fflush(stdin);

error("数目不符合要求");

continue;

}

bp->count = bnum;

printf("修改成功\n");

return id;

}

break;

case3:

while(1){

char c;

int status;

status = bp->status;

status == AVAILABLE ? printf("修改状态为[不可借]：Y N\n") : printf("修改状态为[可借]：Y N\n");

scanf("%c", &c);

getchar();

if(!( c =='Y'|| c =='y'|| c =='N'|| c =='n')){

fflush(stdin);

error("指令无效");

continue;

}

if(c =='Y'|| c =='y'){

status == AVAILABLE ? bp->status = UNAVAILABLE : (bp->status = AVAILABLE);

printf("修改成功\n");

return id;

}else{

printf("放弃修改\n");

return0;

}

}

break;

case0:

return0;

default:

error("获取参数失败");

break;

}

}

}else{

printf("没有此图书\n");

return0;

}

}

return-1;

}int delbook(){

system(CLEAR); ///////////////////////////////////////////Book *bp, *fbp;

intid =0;

printf("请输入要注销的图书编号：\n");

scanf("%d", &id);

getchar();

if(!(id >0&& id

fflush(stdin);

error("图书编号不符合要求");

return-1;

}

for(fbp = bp = head; bp != NULL; fbp = bp, bp = bp->next){

if(bp->id == id){

printbook(bp);

break;

}

}

if(bp != NULL){

while(1){

printf("确定要注销此图书：Y N\n");

char YN;

scanf("%c", &YN);

getchar();

if(!((YN =='Y'|| YN =='y') || (YN =='N'|| YN =='n'))){

fflush(stdin);

error("指令无效\n");

continue;

}

if(YN =='Y'|| YN =='y'){

bp == head ? head = bp->next : (fbp->next = bp->next);

free(bp->name); //2018-05-26修改：添加释放name这块内存//bp内存的只是指向name的指针

free(bp);

bp = NULL; printf(

"图书注销成功\n");

break;

}else{

printf("放弃注销\n");

return0;

}

}

return id;

}else{

printf("要注销的图书编号不存在\n");

return-1;

}

return-1;

}