problem on typedef

fwongmc · #1 23-Dec-2004, 09:30

Dear all,

I am writing a function(actually I am writing several functions for a program) that using typedef,

CPP / C++ / C Code:

#include <stdio.h>
#include <stdlib.h>
int i;

typedef struct{
		int day;
		int month;
		int year;}date;

		date user_input (void);

		void main (){
			user_input();
			
			printf("The date is %d",date.day);
			printf("\nThe month is %d",date.month);
			printf("\nThe year is %d",date.year);
		}
		


		date user_input (void){
			printf ("Enter Date:");
			scanf("%d/%d/%d",&date.day,&date.month,&date.year);
			
		}

When it complies,it display that :
A:\***_6.c(15) : error C2059: syntax error : 'type'
A:\***_6.c(16) : error C2059: syntax error : 'type'
A:\***_6.c(17) : error C2059: syntax error : 'type'
A:\***_6.c(22) : error C2061: syntax error : identifier 'user_input'
A:\***_6.c(22) : error C2059: syntax error : ';'
A:\***_6.c(22) : error C2059: syntax error : 'type'

I guess I cannot just pass the structure 'date' stuffs into the function for reading the data.Can anyone tell me what's the problem was?and by the way,
I need to declar another structure using typedef,same as 'date',with an addition of name,thus I am going to write in this way:

CPP / C++ / C Code:

typedef struct{
char name[20];
struct date brithday;}

but it is also failure,can any of your experts tell me why?thanks for your help!

fwongmc · #2 23-Dec-2004, 10:08

The functiom prototypes are fixed:

CPP / C++ / C Code:

date user_input (void);

and the struct date stores the structure including a day,month and a year.
The program ask for user input and display the putput for error checking

davekw7x · #3 23-Dec-2004, 10:27

Quote:

Originally Posted by fwongmc

Dear all,

I am writing a function(actually I am writing several functions for a program) that using typedef,

CPP / C++ / C Code:

#include <stdio.h>
#include <stdlib.h>
int i;

typedef struct{
		int day;
		int month;
		int year;}date;

		date user_input (void);

		void main (){
			user_input();
			
			printf("The date is %d",date.day);
			printf("\nThe month is %d",date.month);
			printf("\nThe year is %d",date.year);
		}
		


		date user_input (void){
			printf ("Enter Date:");
			scanf("%d/%d/%d",&date.day,&date.month,&date.year);
			
		}

When it complies,it display that :
A:\***_6.c(15) : error C2059: syntax error : 'type'
A:\***_6.c(16) : error C2059: syntax error : 'type'
A:\***_6.c(17) : error C2059: syntax error : 'type'
A:\***_6.c(22) : error C2061: syntax error : identifier 'user_input'
A:\***_6.c(22) : error C2059: syntax error : ';'
A:\***_6.c(22) : error C2059: syntax error : 'type'

I guess I cannot just pass the structure 'date' stuffs into the function for reading the data.Can anyone tell me what's the problem was?and by the way,
I need to declar another structure using typedef,same as 'date',with an addition of name,thus I am going to write in this way:

CPP / C++ / C Code:

typedef struct{
char name[20];
struct date brithday;}

but it is also failure,can any of your experts tell me why?thanks for your help!

First of all, you haven't actually created a struct. You have told the C compiler what you mean by "date", but you don't actually have one yet.

CPP / C++ / C Code:

typedef struct {
    int day;
    int month;
    int year;
} date;

int main()
{
  date the_date;

Now you have a struct, named "the_date". How do you get a function to read something into this struct? Well you could pass a pointer to the struct to the function:

CPP / C++ / C Code:

typedef struct {
    int day;
    int month;
    int year;
} date;

int main()
{

    void user_input(date *); /* this is the prototype */

    date the_date;          /* this is the struct you have to work with */

    user_input(&the_date);  /* this calls the function with the address of the struct*/

Now, write the function to handle a pointer to a struct. Something like this:

CPP / C++ / C Code:

void user_input (date *Mydate)
{
 
  scanf("%d.....", &Mydate->day ...);

Regards,

Dave

davekw7x · #4 23-Dec-2004, 12:03

Quote:

Originally Posted by fwongmc

The functiom prototypes are fixed:

CPP / C++ / C Code:

date user_input (void);

and the struct date stores the structure including a day,month and a year.
The program ask for user input and display the putput for error checking

I'm sorry, I didn't see your second post at the time I responded to your first one. If you have to do it this way, here's one possibility:

CPP / C++ / C Code:

date user_input ()
{
  date Mydate;

  scanf("%d...", &Mydate.day, ...);

  return Mydate

Then the main looks something like:

CPP / C++ / C Code:

int main (){

  date the_date;
  the_date = user_input();
  
  printf("The date is %d",the_date.day);

  ...

Regards,

Dave

fwongmc · #5 23-Dec-2004, 12:11

Thanks for your help,and one more question
now I have one struct:

CPP / C++ / C Code:

typedef struct {
      int day;
      int month;
      int year}date;

date input;

Now I am writing another struct,using same variable of the struct 'date'

CPP / C++ / C Code:

typedef struct {
     char name[20];
     date brithday;}ndate;

ndate search

Does it works?

search.brithday.day==input.day?

davekw7x · #6 23-Dec-2004, 13:51

Quote:

Originally Posted by fwongmc

Thanks for your help,and one more question
now I have one struct:

CPP / C++ / C Code:

typedef struct {
      int day;
      int month;
      int year}date;

date input;

Now I am writing another struct,using same variable of the struct 'date'

CPP / C++ / C Code:

typedef struct {
     char name[20];
     date brithday;}ndate;

ndate search

Does it works?

search.brithday.day==input.day?

No, the == does not automatically hold. You are defining two different structs. Things are equal only if you set them equal.

Here's an example:

CPP / C++ / C Code:

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

typedef struct {
  int day;
  int month;
  int year;
} date;

typedef struct {
  char name[20];
  date birthday;
} ndate;


date user_input(void);

int main (){

  date the_date;
  ndate the_ndate;

  strcpy(the_ndate.name, "Dave");


  the_date = user_input();

  the_ndate.birthday = the_date;

  printf("The date is %d\n",the_date.day);
  printf("The month is %d\n",the_date.month);
  printf("The year is %d\n",the_date.year);

  printf("\n");

  printf("the_ndate.name = %s\n", the_ndate.name);
  printf("the_ndate.birthday.day = %d\n", the_ndate.birthday.day);
  printf("the_ndate.birthday.month = %d\n", the_ndate.birthday.month);
  printf("the_ndate.birthday.year = %d\n", the_ndate.birthday.year);

  return 0;
}
    
date user_input ()
{
  date Mydate;
  printf ("Enter Date:");
  scanf("%d/%d/%d",&Mydate.day, &Mydate.month, &Mydate.year);
  return Mydate;
}

Regards,

Dave

fwongmc · #7 23-Dec-2004, 22:41

Well,thanks for your guys' help.Now,I wish to open a file form harddisk,if the function returns 0,the other statement goes,otherwise,the program is terminate.

the functoin prototype FILE* open_file (char filename[],char mode) is fixed

Here is my program

CPP / C++ / C Code:

#include <stdio.h>
#include <stdlib.h>
int i;

typedef struct{/*define struct date*/
		int day;
		int month;
		int year;}date;
typedef struct{/*define struct ndate*/
     char name[20];
     date brithday;}ndate;

		
		date user_input (void);/*function prototype*/
		FILE* open_file(char filename[],char mode[]);/*function prototype*/
		date input;/*define date*/
		ndate search;/*define ndate*/
		int main (){
			user_input();
			
			printf("The input.day is %d",input.day);
			printf("\nThe input.month is %d",input.month);
			printf("\nThe input.year is %d",input.year);
			if ((open_file("brithday.txt","r"))==1){
				printf("\nError!");}
			if ((open_file("brithday.txt","r"))==0){
				printf("\nok!");}
		}
		


		date user_input (void){
			printf ("Enter Date:");
			scanf("%d/%d/%d",&input.day,&input.month,&input.year);
			return (input);
		}
			
		FILE* open_file(char filename[],char mode[]){

			if ((fopen(filename,mode))==NULL){
				printf ("\nFile cannot be opened");
				return 1;}
			
			else
				printf ("\nYour file is okay!");
			return 0;}

The program can do what I want to do,it can return 0/1 depends on the file exits or not.But,the complier told me that Ive errors:
C:\Documents and Settings\User\桌面\***_6.c(24) : warning C4047: '==' : 'struct _iobuf *' differs in levels of indirection from 'const int '
C:\Documents and Settings\User\桌面\***_6.c(42) : warning C4047: 'return' : 'struct _iobuf *' differs in levels of indirection from 'const int '

How can I change my code in order to fit what I want to do(use the function as a control statement)

fwongmc · #8 23-Dec-2004, 22:46

Dave,

Here I have 2 struct

CPP / C++ / C Code:

typedef struct{
int day;
int month;
int year;}date;

typedef struct{
char name[20];
date brithday;}ndate;

void man()
date input;
ndate search;

}

Does search.brithday.* consists the SAME STRUCTURE as the sturct input?(they carries different values)
Example:search.brithday.day...etc

aaroncohn · #9 24-Dec-2004, 00:33

Quote:

Originally Posted by fwongmc

Does search.brithday.* consists the SAME STRUCTURE as the sturct input?(they carries different values)
Example:search.brithday.day...etc

Yes, the search.birthday structure is of type date, and the input structure is of type date. Although, just a note... you misspelled "birthday."

I have a question about your open_file function. The function's return value is a pointer to a FILE, so why does your code return an integer value? Also, you have some problems with your file I/O. Since you never assign the return value of fopen() to a FILE pointer, the value is lost in memory, and the file is not closed. One more thing... please attempt clearer style when coding. Your style makes reading your code difficult. Go ahead and take a look at this tutorial, written by our very own WaltP.

fwongmc · #10 24-Dec-2004, 01:24

Well,thanks for your guys' help.Now,I wish to open a file form harddisk,if the function returns 0,the other statement goes,otherwise,the program is terminate.

the functoin prototypeFILE* open_file (char filename[],char mode) is fixed

Here is my program

CPP / C++ / C Code:

#include <stdio.h>
#include <stdlib.h>
int i;

typedef struct{/*define struct date*/
		int day;
		int month;
		int year;}date;
typedef struct{/*define struct ndate*/
     char name[20];
     date brithday;}ndate;

		
		date user_input (void);/*function prototype*/
		FILE* open_file(char filename[],char mode[]);/*function prototype*/
		date input;/*define date*/
		ndate search;/*define ndate*/
		int main (){
			user_input();/*execute function user_input*/
			
			printf("The input.day is %d",input.day);/*check only*/
			printf("\nThe input.month is %d",input.month);/*check only*/
			printf("\nThe input.year is %d",input.year);/*check only*/
			if (!open_file("brithday.txt","r")){
				printf("\nOK!");}
			else{
				printf("\nError!");}
		}
		


		date user_input (void){/*function user_input main*/
			printf ("Enter Date:");
			scanf("%d/%d/%d",&input.day,&input.month,&input.year);
			return (input);
		}
			
		FILE* open_file(char filename[],char mode[]){/*function open_file main*/

			if ((fopen(filename,mode))==NULL){
				printf ("\nFile cannot be opened");
				return 1;}
			
			else
				printf ("\nYour file is okay!");
			return 0;}

The program can do what I want to do,it can return 0/1 depends on the file exits or not.But,the complier told me that Ive errors:
C:\Documents and Settings\User\桌面\***_6.c(42) : warning C4047: 'return' : 'struct _iobuf *' differs in levels of indirection from 'const int '

How can I change my code in order to fit what I want to do(use the function as a control statement)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
still problem with polynom linked list	if13121	C Programming Language	7	23-Nov-2004 00:02
linked list problem	if13121	C Programming Language	10	11-Nov-2004 13:34
c simple question problem with switch case	if13121	C Programming Language	2	25-Oct-2004 02:06
typedef struct problem	grizli	C Programming Language	8	19-Jun-2004 17:32
Another FX 5600 problem (but with details that might shed light on this)	BobDaDuck	Computer Hardware Forum	2	16-Apr-2004 08:53