我正在开发一个简单的酒店预订管理系统，但我遇到了一个小问题。仅当system("cls");函数调用mainMenu()函数时，mainMenu()函数中的bookRoom()才起作用。我试过用其他功能做得很好，我不知道为什么会这样。
我的错误在哪里？
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <windows.h>
char exitOpt[1],cfm[1];;
int mainMenu_Opt;
int chk = 0;
int advance[4] = {750, 500, 250, 125};
int roomFee[4] = {1500, 1000, 500 ,250};
int rT[4] = {1,2,3,4};
int roomAvail[4] = {1,2,2,5};
struct guest{
char id[5];
char name[30];
int age;
int r_type;
int chk_in_date;
int chk_out_date;
int per;
int totPay;
int paid;
int balance;
};
struct guest grec;
FILE *fguest,*ftemp;
void main();
void mainMenu();
void checkRoom();
void putRAV();
int bookRoom();
void vldRT();
void readData();
void exitProgram ();
void mainMenu()
{
system("cls");
for(;;)
{
fguest = fopen("guest_list.dat","rb");
while(fread(&grec,sizeof(grec),1,fguest)==1 )
{
if (grec.r_type == chk)
roomAvail[chk-1]--;
}
chk = 0;
fclose(fguest);
printf("\n Welcome to HRMS \n\n");
printf("\tMain Menu\n\n");
printf("1. Check Room's Availability\n\n");
printf("2. Book A Room\n\n");
printf("3. Check Out a Room Guest\n\n");
printf("4. Edit Reservation\n\n");
printf("5. Search\n\n");
printf("6. Exit\n\n");
printf("Please, enter your choice (1-6): ");
scanf("%d",&mainMenu_Opt);
fflush(stdin);
switch(mainMenu_Opt)
{
case 1: { putRAV();
break; }
case 2: {
bookRoom();
break; }
// case 3: { chkoRoom();
// break; }
//
// case 4: { editRes();
// break; }
//
case 5: { readData();
break; }
case 6: { exitProgram();
break; }
default: printf("\nInvalid Input. Please try again with valid input (whole number between 1 - 6).\n ");
}
}
}
void checkRoom()
{
system("cls");
fguest = fopen("guest_list.dat","rb");
while(fread(&grec,sizeof(grec),1,fguest)==1 )
{
switch (grec.r_type)
{
case 1: {
roomAvail[0]--;
break; }
case 2: {
roomAvail[1]--;
break; }
case 3: {
roomAvail[2]--;
break; }
case 4: {
roomAvail[3]--;
break; }
}
}
fclose(fguest);
}
void putRAV()
{
system("cls");
int j;
for (j = 0; j < 4; j++)
{
printf("%d\n", roomAvail[j]);
}
printf("Back to main (Y/N)?: "); gets(cfm); fflush(stdin);
if ((strcmp(cfm,"Y")==0) || (strcmp(cfm,"y")==0))
{ printf("Returning to main menu...\n");
Sleep(1000);
mainMenu(); }
else if ((strcmp(cfm,"N")==0) || (strcmp(cfm,"n")==0))
{ putRAV(); }
else
{ printf("\nInvalid Input. Returning to ReadData\n");
putRAV(); }
}
int bookRoom()
{
system("cls");
fflush(stdin);
grec.totPay = 0;
fguest = fopen("guest_list.dat","ab+");
printf("\n\tBook A Room");
printf("\n\nGuest\'s ID\t\t: "); scanf("%s",grec.id); fflush(stdin);
printf("Guest\'s Name\t\t: "); scanf("%30s",grec.name); fflush(stdin);
printf("Guest\'s Age\t\t: "); scanf("%d",&grec.age); fflush(stdin);
printf("Room\'s Type\t\t: "); scanf("%d",&grec.r_type); fflush(stdin);
vldRT();
printf("Check-in Date\t\t: "); scanf("%d",&grec.chk_in_date); fflush(stdin);
printf("Check-out Date\t\t: "); scanf("%d",&grec.chk_out_date); fflush(stdin);
printf("Staying Period\t\t: "); scanf("%d",&grec.per); fflush(stdin);
grec.totPay = (roomFee[grec.r_type - 1] * grec.per) - advance[grec.r_type-1];
printf("Total Payment\t\t: %d\n", grec.totPay);
printf("Total Paid\t\t: "); scanf("%d",&grec.paid); fflush(stdin);
grec.balance = grec.totPay - grec.paid;
printf("Balance\t\t\t: %d \n\n",grec.balance);
printf("\t\t Confirm Booking (Y/N)?: "); gets(cfm); fflush(stdin);
if ((strcmp(cfm,"Y")==0) || (strcmp(cfm,"y")==0))
{ fwrite(&grec,sizeof(grec),1,fguest);
fclose(fguest);
chk = grec.r_type;
printf("Room successfully booked...\n");
printf("Returning to main menu...\n");
Sleep(1000);
return chk;
}
else if ((strcmp(cfm,"N")==0) || (strcmp(cfm,"n")==0))
{ bookRoom(); }
else
{ printf("\nInvalid Input. Returning to Book A Room\n");
bookRoom(); }
mainMenu();
}
void vldRT()
{
if (grec.r_type <= 0 || grec.r_type >4)
{
printf("Invalid input!! Input must be between 1 - 4\n");
printf("Please try again:\n");
printf("Room\'s Type\t\t: "); scanf("%d",&grec.r_type); fflush(stdin); }
}
void exitProgram ()
{
printf("\nExit program (Y/N)? "); gets(exitOpt); fflush(stdin);
if ((strcmp(exitOpt,"Y")==0) || (strcmp(exitOpt,"y")==0))
exit(0);
else if ((strcmp(exitOpt,"N")==0) || (strcmp(exitOpt,"n")==0))
mainMenu();
else
printf("\nInvalid Input. Please try again with valid input (Y/N). \n");
exitProgram();
}
void readData()
{
system("cls");
fguest = fopen("guest_list.dat","rb");
rewind(fguest);
while(fread(&grec,sizeof(grec),1,fguest)==1) //continue reading until there's no more struct data
{
printf("\n\nGuest\'s ID\t\t: %s", grec.id);
printf("\nGuest\'s Name\t\t: %s",grec.name);
printf("\nGuest\'s Age\t\t: %d",grec.age);
printf("\nRoom\'s Type\t\t: %d",grec.r_type);
printf("\nCheck-in Date\t\t: %d",grec.chk_in_date);
printf("\nCheck-out Date\t\t: %d",grec.chk_out_date);
printf("\nStaying Period\t\t: %d",grec.per);
printf("\nTotal Payment\t\t: %d", grec.totPay);
printf("\nTotal Paid\t\t: %d",grec.paid);
printf("\nBalance\t\t\t: %d \n\n",grec.balance);
}
fclose(fguest);
printf("Back to main (Y/N)?: "); gets(cfm); fflush(stdin);
if ((strcmp(cfm,"Y")==0) || (strcmp(cfm,"y")==0))
{ printf("Returning to main menu...\n");
Sleep(1000);
mainMenu(); }
else if ((strcmp(cfm,"N")==0) || (strcmp(cfm,"n")==0))
{ readData(); }
else
{ printf("\nInvalid Input. Returning to ReadData\n");
readData(); }
}
void main()
{
checkRoom();
mainMenu();
}
答案 0 :(得分：-2)
为什么不制作可移植的自己的cls功能？
void my_cls(void) {
int i = 5000;
while (i-->0)
printf("\n");
}