Help with Header Files and Source files

This is a discussion on Help with Header Files and Source files within the C Programming forums, part of the General Programming Boards category; Hi I am trying to understand why i am getting an error at compiling my header file and source file ...

  1. #1
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    May 2008
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    Help with Header Files and Source files

    Hi

    I am trying to understand why i am getting an error at compiling my header file and source file

    both are provided below


    here is the error

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    here is the header file

    Code:
    #define TRUE           1
    #define FALSE          0
    
    #define MAX_LINE     256
    #define MAX_TEXT    4096
    
    typedef struct date    Date;
    typedef struct time    Time;
    typedef struct msgNode MsgNode;
    
    struct date {
      int day;
      int month;
      int year;
    };
    
    struct time {
      int hour;
      int minute;
      int second;
    };
    
    struct msgNode {
      int   messageNum;
      int   inReplyTo;
      int   indent;
      int   deleted;
      char *name;
      Date  date;
      Time  time;
      char *text;
      MsgNode *next;
    };
    
    // INSERT NEW FUNCTION PROTOTYPES, AS APPROPRIATE
    
    void printPrompt();
    void   printHelp();
    MsgNode *getNode( void );
    char    *getName( void );
    char    *getText( void );
    void     getDate( Date *d );
    int     scanDate( Date *d );
    void     getTime( Time *t );
    int     scanTime( Time *t );
    int       dateOK( Date *d );
    int       timeOK( Time *t );
    void printPadded( int n, char ch );
    void   printDate( Date d );
    void   printTime( Time t );
    void  printBrief( MsgNode * msg );
    void   printFull( MsgNode * msg );
    void    freeList( MsgNode *list );
    here is the source file

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <ctype.h>
    #include <unistd.h>
    
    #include "hw2.h"
    
    
    int globalMessageNum = 1;
    
    
    int main( void )
    {
      MsgNode *list = NULL;
      MsgNode *node;
      char command[MAX_LINE];
      char c;
    
      printPrompt();
    
      // enter a loop, reading and executing commands from the user
      while( fgets(command,MAX_LINE,stdin) != NULL ) {
        char *p;
    
        // replace newline with end-of-string character
        if(( p = strchr(command,'\n')) != NULL ) {
          *p = '\0';
        }
        p = command;
        while( isspace(*p)) { // skip any initial spaces
          p++;
        }
        c = *p;
    
        if( isdigit(c)) {
    
          // INSERT CODE FOR JUMPING TO MESSAGE k
        }
        else switch( c ) {
    
        case 'a': case 'A': // Add item
          // MODIFY THIS CODE, AS APPROPRIATE
          node = getNode();
          printFull( node );
          break;
    
          // INSERT CODE HERE
    
          // TO IMPLEMENT OTHER COMMANDS
    
        case 'h': case 'H': // Help
          printHelp();
          break;
    
        case 'q': case 'Q': // Quit
          freeList( list );
          printf("Bye!\n");
          return 0;
          break;
        }
    
        printPrompt();
      }
    
      return 0;
    }
    
    // INSERT NEW FUNCTIONS, AS APPROPRIATE
    
    /************************************************************
       Print prompt only if output goes to screen
    */
    void printPrompt()
    {
      if (isatty(fileno(stdin))) {
        printf("Enter command (A,F,B,P,L,D,R,T,S,U,Q, H for Help): ");
      }
    }
    
    /************************************************************
       Print the list of commands available to the user,
       and a brief summary of what each command does.
    */
    void printHelp()
    {
      printf("\n");
      printf(" A - Add\n" );
      printf(" L - List\n" );
      printf(" P - Print\n" );
      printf(" F - Forward\n" );
      printf(" B - Back\n" );
      printf("<k>- jump to message k\n");
      printf(" D - Delete\n");
      printf(" R - Reply\n");
      printf(" T - Threads\n");
      printf(" S - Search\n");
      printf(" U - Undo\n" );
      printf(" Q - Quit\n");
      printf(" H - Help\n");
      printf("\n");
    }
    
    /************************************************************
       allocate space for a new message and get the
       name, date, time and text from standard input.
    */
    MsgNode * getNode( void )
    {
      MsgNode * new_node;
      new_node = (MsgNode *)malloc(sizeof(MsgNode));
      if( new_node == NULL ) {
         printf("Error: could not allocate memory.\n");
         exit( 1 );
      }
      new_node->messageNum= globalMessageNum++;
      new_node->inReplyTo = 0;
      new_node->indent    = 0;
      new_node->deleted   = FALSE;
      new_node->name      = getName();
      getDate( &new_node->date );
      getTime( &new_node->time );
      new_node->text      = getText();
      new_node->next      = NULL;
    
      return( new_node );
    }
    
    /************************************************************
       Read one line of text from standard input,
       store it in a string and return a pointer to the string.
    */
    char * getName( void )
    {
      char buffer[MAX_LINE];
      char *name;
      int length;
      int ch;
      int i;
    
      // prompt user for input
      printf( "Name: " );
      // skip any intial newline character
      if(( ch = getchar()) == '\n' ) {
         ch = getchar();
      }
      // read text initially into a buffer
      i=0;
      while( i < MAX_LINE && ch != '\n' && ch != EOF ) {
         buffer[i++] = ch;
         ch = getchar();
      }
      // trim of any trailing whitespace
      while( isspace( buffer[i-1] )) {
        i--;
      }
      // allocate just enough space to store the string
      length = i;
      name = (char *)malloc((length+1)*sizeof(char));
      if( name == NULL ) {
         printf("Error: could not allocate memory.\n");
         exit( 1 );
      }
      // copy text from buffer into new string
      for( i=0; i < length; i++ ) {
         name[i] = buffer[i];
      }
      name[i] = '\0'; // add end-of-string marker
    
      return( name );
    }
    
    /************************************************************
       Read several lines of text from standard input,
       store them in a string and return a pointer to the string.
    */
    char * getText( void )
    {
      char buffer[MAX_TEXT];
      char *text;
      int length;
      int ch;
      int i;
    
      printf("Text: ");
      ch = getchar();
      i=0;
      while(( i < MAX_TEXT )&&( ch != EOF )) {
         buffer[i++] = ch;
         ch = getchar();
         // stop when you encounter a dot on a line by itself
         if( i > 1 && ch == '\n' && buffer[i-1] == '.'
                                 && buffer[i-2] == '\n' ) {
            ch = EOF;
            i  = i-2; // strip off the dot and newlines
         }
      }
      length = i;
      // allocate just enough space to store the string
      text = (char *)malloc((length+1)*sizeof(char));
      if( text == NULL ) {
         printf("Error: could not allocate memory.\n");
         exit( 1 );
      }
      // copy text from buffer to new string
      for( i=0; i<length; i++ ) {
         text[i] = buffer[i];
      }
      text[i] = '\0'; // add end-of-string marker
    
      return( text );
    }
    
    /************************************************************
       Get date from standard input;
       if date is invalid, ask the user to re-enter it.
    */
    void getDate( Date *d )
    {
      printf("Date: ");
      while( !scanDate( d ) || !dateOK( d )) {
         printf("Re-enter date in format dd/mm/yy: ");
      }
    }
    
    /************************************************************
       scan date in the format dd/mm/yyyy
    */
    int scanDate( Date *d )
    {
      char s[MAX_LINE];
    
      fgets( s, MAX_LINE, stdin );
      if(sscanf(s,"%d/%d/%d",&d->day,&d->month,&d->year)<3){
        return FALSE;
      }
      if( d->year < 100 ) { // turn /12 into /2012, etc.
        d->year = 2000 + d->year;
      }
      return TRUE;
    }
    
    /************************************************************
       Get time from standard input;
       if time is invalid, ask the user to re-enter it.
    */
    void getTime( Time *t )
    {
      printf("Time: ");
      while( !scanTime( t ) || !timeOK( t )) {
         printf("Re-enter time in format hh:mm:ss: ");
      }
    }
    
    /************************************************************
       scan time in the format hh:mm:ss
    */
    int scanTime( Time *t )
    {
      char s[MAX_LINE];
    
      fgets( s, MAX_LINE, stdin );
      return(
         sscanf(s,"%d:%d:%d",&t->hour,&t->minute,&t->second)==3);
    }
    
    /************************************************************
       Return TRUE if date is valid; FALSE otherwise.
    */
    int dateOK( Date *d )
    {
    	int leap_year;
    	
    	/*30 days hath September,
    	  April, June and November,
    	All the rest have 31,
    	  Excepting February alone
    	(And that has 28 days clear,
    	  With 29 in each leap year)*/
    	
    	//check year is start of Gregorian Calendar
    	if(d.year<1582)
    		return FALSE;
    	
    	//check month is correct range 1-12
    	if(d.month<1||d.month>12)
    		return FALSE;
    	
    	//check that the days of the month are correct
    	if(d.month==11||d.month==9||d.month==4||d.month==6){
    		if(d.day<1||d.day>30)
    			return FALSE;
    	}		
    	else if(d.day<1||d.day>31)
    		return FALSE;
    	
    	//check for leap year of d.year in order to check for February correct date
    	if(d.year%400==0)
       	   leap_year=TRUE;
    	else if(d.year%100==0)
       	   leap_year=FALSE;
    	else if(d.year%4==0)
       	   leap_year=TRUE;
    	else
       	   leap_year=FALSE;
    	
    	//check days in February are correct if leap year or if not leap year
    	if(d.month==2&&leap_year){
    		if(d.day>29)
    			return FALSE;
    	}
    	else if(d.month==2&&d.day>28)
    		return FALSE;
    
      return TRUE;
    }
    
    /************************************************************
       Return TRUE if time is valid; FALSE otherwise.
    */
    int timeOK( Time *t )
    {
      return(   t->hour   >= 0 && t->hour   < 24
             && t->minute >= 0 && t->minute < 60
             && t->second >= 0 && t->second < 60 );
    }
    
    // INSERT NEW FUNCTIONS, AS APPROPRIATE
    
    /************************************************************
      Print the specified integer in two digits (prefixed with '0'
      if necessary), followed by the specified character.
    */
    void printPadded( int n, char ch )
    {
      if( n < 10 ) {
        putchar('0');
      }
      printf("%d%c",n,ch );
    }
    
    /************************************************************
      Print date in the format dd/mm/yyyy
    */
    void printDate( Date d )
    {
      printPadded( d.day,  '/');
      printPadded( d.month,'/');
      printf("%d ", d.year );
    }
    
    /************************************************************
      Print time in the format hh:mm:ss
    */
    void printTime( Time t )
    {
      printPadded( t.hour,  ':');
      printPadded( t.minute,':');
      printPadded( t.second,' ');
    }
    
    /************************************************************
      Print the Name, followed by the first line of the Text.
    */
    void printBrief( MsgNode * msg )
    {
      char *text=msg->text;
      int i=0,j=0;
      if( msg->deleted ) {
        printf("[deleted]\n");
      }
      else {
        printf("%s: ", msg->name );
        while( isspace( text[i] )) {
          i++;
        }
        while( j < 40 && text[i+j] != '\0'
                      && text[i+j] != '\n' ) {
          putchar( text[i+j] );
          j++;
        }
        putchar('\n');
      }
    }
    
    /************************************************************
      Print message in Full
    */
    void printFull( MsgNode * msg )
    {
      if( msg != NULL ) {
        printf("Message %d", msg->messageNum );
        if( msg->deleted ) {
          printf(" has been deleted.\n");
        }
        else {
          printf("\nDate: ");
          printDate( msg->date );
          printf("\nTime: ");
          printTime( msg->time );
          printf("\nName: %s\n", msg->name );
          printf("Text: %s\n", msg->text );
        }
      }
    }
    
    /************************************************************
      Free all memory occupied by linked list of messages
    */
    void freeList( MsgNode *head )
    {
      MsgNode *node;
      while( head != NULL ) {
        node = head;
        head = head->next;
        free( node->name );
        free( node->text );
        free( node );
      }
    }

  2. #2
    Registered User
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    May 2008
    Posts
    48
    the issue is in the function dateOk at line 185

    it says the members are not part of a structure or union, but they are!!! if u check the header ile you will see under the struct date it contains these members

  3. #3
    Registered User
    Join Date
    May 2008
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    48
    forget it i solved this

    replaced the dot operator with ->

  4. #4
    C++ Witch laserlight's Avatar
    Join Date
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    Location
    Singapore
    Posts
    23,786
    Quote Originally Posted by yukapuka
    it says the members are not part of a structure or union, but they are!
    They aren't

    The reason is that d is a pointer. Thus, instead of d.year, you should have written d->year.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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