#define MAXSIZE 5

#define NULL 0

#define SENTINEL -1

typedef struct

{

int month;

int day;

int year;

}date;

typedef struct

{

char name[MAXSIZE];

int share;

float value;

date datebought;

}infofield;

typedef struct listrecord

{

infofield info;

struct listrecord *link;

}stockrecord,*listpointer;

listpointer next(pointer)

/* Returns a copy of the

link field in the record

pointed to by pointer

*/

listpointer pointer;

{

return(pointer->link);

}

listpointer setnull()

/* Returns a null pointer */

{

return(NULL);

}

setlink(pointer1,pointer2)

/* Sets the link field of the

record pointed to by pointer1

to the contents of pointer2

*/

listpointer pointer1,pointer2;

{

pointer1->link = pointer2;

}

setinfo(pointer1,pointer2)

/* Sets the infofield of the record

pointed to by pointer1 to the

infofield of the record

pointed to by pointer2

*/

listpointer pointer1,pointer2;

{

int i;

for(i=0;i<MAXSIZE;i++)

pointer1->info.name[i] = pointer2->

info.name[i];

pointer1->info.shares = pointer2->

info.shares;

pointer1->info.value = pointer2->info.value;

pointer1->info.datebought.month = pointer2->

info.datebought.month;

pointer1->info.datebought.day = pointer2->

info.datebought.day;

pointer1->info.datebought.year = pointer2->

info.datebought.year;

}

listpointer avail()

/* Returns a pointer to storage

allocated for a record of type

stockrecord

*/

{

listpointer malloc();

return(malloc(sizeof(stockrecord)));

}

anotherrecord(recordpointer)

/* Returns true if there is

another record

*/

listpointer recordpointer;

{

listpointer setnull();

return(recordpointer != setnull());

}

listpointer getnextrecord()

/* Inputs the data for the new

record and returns a pointer

to a record containing the data

in its infofield, or, if there

are no new records,returns

a null pointer

*/

{

listpoiner setnull();

static stockrecord nextrecord;

printf("Enter number of shares\n");

scanf("%d",&(nextrecord.info.shares));

if(nextrecord.info.shares != SENTINEL)

{

printf(" Enter the stock name - less than

%d characters\n",MAXSIZE);

scanf("%s",nextrecord.info.name);

printf(" Enter the price of one share of

the stock\n");

scanf("%f",&(nextrecord.info.value));

printf(" Enter the month day year of the

stock purchase\n");

scanf("%d %d %d",&(nextrecord.info.

datebought.month),

&(nextrecord.info.datebought.day),

&(nextrecord.info.datebought.year));

return(&nextrecord);

}

else

return(setnull());

}

printrecord(recordpointer)

/* Prints the contents of the infofield

of the record pointed to by recordpointer

*/

listpointer recordpointer;

{

printf(" The stock is %s\n",

recordpointer->info.name);

printf(" The number of shares is %d\n",

recordpointer->info.shares);

printf(" The value of a share is %f\n",

recordpointer->info.value);

printf(" The date of purchase is %d %d %d\n\n",

recordpointer->info.datebought.month,

recordpointer->info.datebought.day,

recordpointer->info.datebought.year);

}