Program crashing, Need help!

Hi, im almost finnished a program, however it keeps crashing after the user enters a value after the first choice in the menu. Heres the code:

Code:

#include <stdio.h>
#include <stdlib.h>

struct details  //array for storing each structure of car details
{
    int rego[50];  //storage for registration
    int drego[50]; //storage for the reigstration of the exiting car
    int amin[50];  //storage for the arrival in minutes
    int ahour[50]; //storage for the arrival in hours
    int dmin[50];  //storage for the departure in minutes, which is added later on by user
    int dhour[50]; //storage for the departure in hours, which is added later on by user
    //int days[50];
    int total[50];
    /*int pay=0;
    int cost;
    int j=0;*/
}newcar;

    int pay=0;
    int cost;
    int j=0;

int feecalc()
{
  int timediffh; //difference in hours calculation integer 
  int timediffm; //difference in minutes calculation integer
  int min; //resultant calculation of minutes in car park
  int hour; //resultant calculation of hours in car park
  float fee; //the initial flat fee of $2
  float extraa; //float for the subtraction of 3 from the number of hours
  float extrab; //float for the multiplication of the $1.5 per hour
  float extrac; //float for the rounding of minutes, adding an aditional hour
  float total; //grand total of what is charged to that car
  float minutecharge; //rounding minutes off to the next hour
  
  timediffh = newcar.dhour[pay] - newcar.ahour[pay];
  timediffm = newcar.dmin[pay] - newcar.amin[pay];
  if(timediffm < 0) //if the number of arrival time has a higher value than the departure time, then add 60
               {
                     min = timediffm +60;
                     hour = timediffh - 1;
               }
  else
               {
                     min = newcar.dmin[pay] - newcar.amin[pay]; //other wise continue on with the original calculation
                     hour = newcar.dhour[pay] - newcar.ahour[pay];
               }

  if(hour < 3)
               {
                     fee = 2.00;
                     newcar.total[pay] = fee;
               }
  else
               {
                     fee = 2.00;
                     extraa = hour - 3;
                     extrab = extraa*1.5;
                     newcar.total[pay] = fee + extrab;
               }
  if ((newcar.dmin > 0) && (hour >= 3))
               {
                     extrac = +1.5;
                     newcar.total[pay] = fee + extrab + extrac;
               }
  if (total >= 10)
               {
                     newcar.total[pay] = 10;
               }
  printf("Number of hours in car park:%ihours %iminutes\n",hour,min);
  printf("Cost for the number of hours is:$%.2f\n",newcar.total[pay]);
}

int entry()
{
  int plate, face;
  printf("###Car Arrival###\n");
  printf("Please Enter a 4 Number Registration Plate:\n");
  scanf("%i", plate);
  for(face = 0;face < 51; face ++)
          {
 if(plate == newcar.rego[j])
               {
                     printf("you suck");
                     entry();
               }
}
newcar.rego[j] = plate;
if(newcar.rego[j] < 10000)
               {
                     printf("WRONG");
               }
newcar.rego[j] = 0;
printf("Please Enter The Time of Car Arrival in hours(24 Hour Time Used):\n");
scanf("%i", &newcar.ahour[j]);
if(newcar.ahour[j] > 24)
               {
                     printf("Fail");
                     entry();
               } 
printf("Please Enter The Time of Car Arrival in Minutes:\n");  
scanf("%i", &newcar.amin[j]);
if (newcar.amin[j] > 60)
               {
                     printf("Fail");
                     entry();
               }
j++;
main();
}

int dept()
{
  int nope;
  int exitplate;
  printf("Please Enter a 4 Number Registration Plate number:\n");
  scanf("%i", &exitplate);
  for(nope = 0; nope < 51; nope++)
       {
          if(exitplate == newcar.rego[nope])
          {   
              newcar.drego[pay] = exitplate;
              if(exitplate < 10000)
          {
              printf("your gay");
              dept();
          }         
  printf("Please Enter The Time of Car Departure in hours(24 Hour Time Used):\n");
  scanf("%i", &newcar.dhour[pay]);
  if(newcar.dhour[pay] > 24)
          {
              printf("EFG");
          }
  if(newcar.dhour[pay] < newcar.ahour[nope])
          {
              printf("Error, cannot leave before entering");
              dept();
          }
  printf("Please Enter The Time of Car Departure in Minutes:\n");
  scanf("%i", &newcar.dmin[pay]);
  if(newcar.dmin[pay] > 60)
          {
              printf("Fail");
              dept();
          }
}}}
                           
int main()
{
  int user;

  printf("1. Car Arrival\n");
  printf("2. Car Departure\n");
  printf("3. Print Out of Daily Data\n");
  printf("4. Quit Program\n");
  scanf("%i", &user);

  switch(user)
{
  {
  case 1://Writes to car structure 
        entry(); 
       

    
  case 2:
        dept();
        feecalc();
  case 3:

       printf("Bull........\n");

     return main();
     }
  }}

In entry you should have
scanf("%d", &plate)
you forgot the &

thanks, i would not have spotted that.

Do not call main in your code. Use loops. Main should be called once and once only. It's special.
And fix your indentation, as well.