C语言：设计一个收银程序，要求程序实现这样的功能：

int price=0,guestpay=0,change=0

void app()

{

printf("输入信闷顾客付款：")

scanf("%d",&guestpay)

if(price==guestpay)

{

printf("交易成功!")

}else if(guestpay>price)

{

change=guestpay-price

printf("找给顾客%d,交易成功！",change)

}else

{

printf("付款枯明不足，交易失败！\n"滑败弯)

app()

}

}

int main()

{

printf("输入价格：")

scanf("%d",&price)

app()

system("pause")

return 0

}

//以下是参考御郑悄代码有相似结构，数据结构自己设丛乱计一下。

//如果没参考价值，手下留情，别点不采纳。

#define MAXPARKINGPOS 100

#define MAXPRICETYPE 3

#define MAXLINE 4096

struct detail

{

char num[MAXLINE]

char name[MAXLINE]

double pricePerHour

time_t start

time_t end

double period

double cost

}

static int currentParkingNum = 0

static struct detail detailBuf[MAXPARKINGPOS]

static double priceBuf[MAXPRICETYPE] = {11.0,22.0,33.0}

int main(void) {

char buf[MAXLINE]

struct detail *myParking

int iChoice,leavingIndex,i,numEexisted

struct tm *begin,*end

while(true) {

selectService:

printf("Service type,what is your choice?\n1.park\n2.leave\n3.exit\n")

gets(buf)

if(strcmp(buf,"3") == 0) {

return 0

}

if(strcmp(buf,"1"镇渣) == 0) {

//park

if(currentParkingNum == MAXPARKINGPOS) {

printf("Sorry,not empty!\n\n")

continue

}

myParking = detailBuf+currentParkingNum

printf("your name:\n")

gets(myParking->name)

printf("your parking num:\n")

gets(myParking->num)

numEexisted = 0

for(i=0i<currentParkingNumi++) {

if(strcmp(detailBuf[i].num,myParking->num) == 0) {

numEexisted =1

break

}

}

if(numEexisted != 0) {

printf("The car %s is in\n\n",myParking->num)

goto selectService

}

selectPrice:

printf("Service cost,what is your choice?\n")

for(int i=0i < MAXPRICETYPE i++) {

printf("%d.$%.2f per hour\n",i+1,priceBuf[i])

}

gets(buf)

iChoice = atoi(buf)

if(!(iChoice >= 1 && iChoice <=MAXPRICETYPE)) {

printf("Your choice is incorrect!\n\n")

goto selectPrice

}

myParking->pricePerHour=priceBuf[iChoice-1]

time(&myParking->start)

currentParkingNum++

printf("Parcking ok!\n\n")

}else if(strcmp(buf,"2") == 0) {

//leave

printf("your parking num:\n")

gets(buf)

myParking = NULL

for(i=0i<currentParkingNumi++) {

if(strcmp(detailBuf[i].num,buf) == 0) {

myParking = &detailBuf[i]

leavingIndex = i

break

}

}

if(myParking ==NULL) {

printf("Cannot find your car!\n\n")

continue

}

myParking->end = time(&myParking->end)

myParking->period = difftime(myParking->end,myParking->start)

myParking->cost= myParking->period/3600.0*myParking->pricePerHour

printf("****** Cost Details ******\n")

printf("name:%s\n",myParking->name)

printf("number:%s\n",myParking->num)

printf("price:%.2f\n",myParking->pricePerHour)

begin = localtime(&myParking->start)

strftime(buf,sizeof(buf),"%Y-%m-%d %H:%M:%S",begin)

printf("begin:%s\n",buf)

end = localtime(&myParking->end)

strftime(buf,sizeof(buf),"%Y-%m-%d %H:%M:%S",end)

printf("end:%s\n",buf)

printf("period:%.2f hour(s)\n",myParking->period/3600.0)

printf("cost:$%.2f\n",myParking->cost)

printf("service:$%.2f per hour\n",myParking->pricePerHour)

for(i = leavingIndex i < currentParkingNumi++) {

if(i+1 < currentParkingNum) {

detailBuf[i]=detailBuf[i+1]

}

}

detailBuf[currentParkingNum-1].cost=0.0

detailBuf[currentParkingNum-1].end=0

detailBuf[currentParkingNum-1].name[0]='\0'

detailBuf[currentParkingNum-1].num[0]='\0'

detailBuf[currentParkingNum-1].period=0.0

detailBuf[currentParkingNum-1].pricePerHour=0.0

detailBuf[currentParkingNum-1].start=0

currentParkingNum--

printf("Leaving ok!\n\n")

}else{

printf("Your choice is incorrect!\n\n")

continue

}

}

return 0

}

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