Why my C program crash - c

Question

I am using "dev cpp" and i'm writing some codes in c
While I'm running the code below, after entering all data in the function 1, the exe file just crash.
there are not error shown before i finish entering all the data ad press enter
What is happening?
// hotel system *work in progress*//
#include<stdio.h>
#include<stdlib.h>
struct book
{
int bookno[20];
char travellername[20];
char destination[20];
char hotelname[20];
char checkin[20];
char checkout[20];
int guestno[20];
char type[20];
float fee;
}b;
void add();//Add new booking
void all(); //view all booking
//void mod(); modify booking
//void search(); search booking
//void del(); delete booking
void main()
{
int choose;
do{
printf("\n *** Welcome to Hong Kong Hotek booking Record and Management System 2017 ***\n");
printf("\n *** This system is developed by CCIT4020 Class No.NL-?? Group No.?? ***");
printf("\n\n\n--<Basic functions>-- \n");
printf("\n1. Add New Hotel Booking Record(s): \n");
printf("\n2. Display All Hotel Booking Records: \n");
printf("\n3. Modify Hotel Booking Record(s): \n");
printf("\n4. Search Hotel Booking Record(s): \n");
printf("\n5. Delete Hotel Booking Record(s): \n");
printf("\n0. Quit: \n");
printf("\nWhat is your option (0-5)? ");
scanf("%d",&choose);
switch (choose)
{
case 1 :
add();
break;
case 2:
all();
break;
//case 3:
// mod();
//break;
//case 4:
// search();
//break;
//case 5:
// del();
//break;
case 0:
exit(0);
break;
default:
printf("Invalid choice! Please enter again!");
break;
}
}while(choose!=0);
}
void add()
{
FILE *fp;
struct book b;
printf("Hotel Booking number: ");
scanf("%s",b.bookno);
printf("Name of Traveller: ");
scanf("%s",b.travellername);
printf("Destination: ");
scanf("%s",b.destination);
printf("Name of Hotel: ");
scanf("%s",b.hotelname);
printf("Check-in Schedule: ");
scanf("%s",b.checkin);
printf("Check-out Schedule: ");
scanf("%s",b.checkout);
printf("Number of Guests: ");
scanf("%s",b.guestno);
printf("Room Type: ");
scanf("%s",b.type);
printf("Total Fee: ");
scanf("%s",b.fee);
fp=fopen("data.txt","a");
if(fp == NULL)
{
printf("There are no data file! please create one!");
}
else
{
fprintf(fp,"%s \n %s \n %s \n %s \n %s \n %s \n %s \n %s \n %s",b.bookno,b.travellername,b.destination,b.hotelname,b.checkin,b.checkout,b.guestno,b.type,b.fee);
printf("One Record Added!");
}
printf("\n");
fclose(fp);
}
void all()
{
char choose;
FILE *fp;
fp = fopen("data.txt","r");
if(fp == NULL)
{
printf("There are no data file!");
exit(1);
}
else
{
system("clear");
while( ( choose = fgetc(fp) ) != EOF )
printf("%c",choose);
}
fclose(fp);
}

Answer 1

Read your compiler messages:
The problem is here:
scanf("%s",b.fee);
The format specifier is %s, but b.fee is a float.
You need this:
scanf("%f", &b.fee);
There are likely more problems like that one. Check them out by yourself. Each scanfformat specifier must match the variable.