get segmentation fault

i want to dynamically locate 5 spaces for spa struct inside of client struct, get segmentation fault and core is dumped any help would be appreciated

Code:

---

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

int Welcome(int); 
int client_info (struct client *D, int visit_num);
int visit_info( struct client *D, int visit_num);

struct client
{
    char l_name[50];
    char f_name[50];
    char bday[15];
    int height;
    int weight;
    int visits;
    struct spa *r;
};

struct spa
{
    char visit_date[15];
    char treat[100];
    double fee;
    char notes[200];
};

int main (void)
{
    int visit_num;
    struct client D[100];
    int i,x;
    for (i=0;i<5;i++)
    {
      D[i].r = (struct spa *) malloc (5 * sizeof (struct spa));
    }
                    /*declare variables*/

        do                        /* loop to contine program */
        {
        x=Welcome(x);
        switch (x)
                {
                case 1: client_info(D, D->visits);
                                break;
                case 2:
                                break;
                case 3:
                        break;
                case 4:
                                break;
                default: printf(" Please enter a valid selection\n\n");
                               
                }
        }       
        while(x !=0);
     
    return(system("pause"));
}

int Welcome (int value)
{
           

        printf ("Welcome to JP Spa Service's\n\n");
    printf ("Choose an option: \n");
    printf ("(1) Enter New Client: \n");
    printf ("(2) Search database by lastname: \n");
    printf ("(3) Search database by date of birth: \n");
    printf ("(4) Change Client database: \n");
    printf ("(5) Print record of one client: \n");
    printf ("(6) Print record of all clients: \n");
    printf ("(7) Calculate fee of client: \n");
        printf ("(0)  To EXIT PROGRAM\n");
        printf ("Please make a selection now: \n");
        scanf ("%d", &value);
    return value;
}

int client_info (struct client *D, int visit_num)
{
    static int x=0;
    char temp[550];
    int temp1=0;
   
   
    printf("\n Enter First Name:\n");
    gets(temp);
    strncpy (D[x].f_name, temp, 550-strlen(temp));
   
    printf("\nEnter Last Name:\n");
    gets(temp);
    strncpy (D[x].l_name, temp, 550-strlen(temp));
   
    printf("\nEnter Date of Birth: (exmpl :2, Oct, 1981)");
    gets(temp);
    strncpy (D[x].bday, temp, 550-strlen(temp));
   
    printf("\nEnter Weight of Client:\n");
    D[x].weight = atoi (gets(temp));
   
    printf("\nEnter total number of visits:\n");
    D[x].visits = atoi (gets(temp));
    visit_num = D[x].visits;
    visit_info(D, D->visits);
    return visit_num;
}
   
int visit_info( struct client *D, int visit_num)
{
int occur=0;
int count=0;
   

printf ( "\nEnter the spa visit date ( example: 3, May, 2002) > " );
 

while ( (gets(D[count].r->visit_date ) != '\0')
                        && ( count < occur) )
  {
    printf("\nVisit date: %s", (D[count].r)->visit_date  );
    // prompt user for spa visit information
    printf ( "\nEnter the treatment recieved on that date > ");
    gets ((D[count].r)->treat);
    printf ( "\nTreatment: %s", (D[count].r)->treat);
    /*spaptr[count].fee = calculate_fee ( count + 1);*/
    // call the calculate fee function
    printf ( "\nFee: $%3.2f", (D[count].r)->fee );
    printf ( "\nEnter notes for client > " );
    gets ((D[count].r)->notes);
    printf ("\nNotes: %s", (D[count].r)->notes );
         
    if ( count < occur - 1 )
      {
      // don't prompt the user for the next visit date unless there                // are more to get
        printf ( "\nEnter the spa visit date > " );
        }
    // increment the counter
    count++;
    }
}

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How about narrowing it down for us? When do you get a seg fault? What're you doing when it happens, and/or, what's the last thing you see on the screen?

Also, don't use gets. It's prone to buffer overflows.

Quzah.