fgets & Structures

This is a discussion on fgets & Structures within the C Programming forums, part of the General Programming Boards category; Hi all, I'm trying to use fgets in a program so that my structure members can store spaces however when ...

  1. #1
    Registered User JM1082's Avatar
    Join Date
    Mar 2011
    Posts
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    Thumbs down fgets & Structures

    Hi all,
    I'm trying to use fgets in a program so that my structure members can store spaces however when the program is run it prints my printf output then automatically inputs a blank string and skips to the following printf output.
    In example:
    Code:
    int appointment(void)
    {
        #define DATE_LEN 4
        #define START_LEN 2
        #define FINISH_LEN 2
        #define TITLE_LEN 20
        #define PLACE_LEN 30
        #define MEET_LEN 30
        #define FILE_NAME "E:\\appointment.txt"
    
        FILE *fp1;
        fp1 = fopen(FILE_NAME, "a");
        if (fp1 == NULL) {
            printf("Can't open %s\n", FILE_NAME);
            exit(EXIT_FAILURE);
        }
    
        struct appointment {
            char date[DATE_LEN + 1];
            char start_time[START_LEN + 1];
            char finish_time[FINISH_LEN + 1];
            char title[TITLE_LEN + 1];
            char place[PLACE_LEN + 1];
            char meet[MEET_LEN + 1];
        } appointment;
    
        printf("\nAppointment date (ddmm): ");
        fgets(appointment.date, sizeof(appointment.date), stdin);
    
        printf("\n00 = 09:00, 01 = 09:30, 16 = 16:30\nAppointment start: ");
        fgets(appointment.start_time, sizeof(appointment.start_time), stdin);
    
        printf("\n1 = 09:30, 02 = 10:00, 17 = 17:00\nAppointment end: ");
        fgets(appointment.finish_time, sizeof(appointment.finish_time), stdin);
    
        printf("\nAppointment name: ");
        fgets(appointment.title, sizeof(appointment.title), stdin);
    
        printf("\nAppointment venue: ");
        fgets(appointment.place, sizeof(appointment.place), stdin);
    
        printf("\nAppointment with: ");
        fgets(appointment.meet, sizeof(appointment.meet), stdin);
    
        fprintf(fp1, "%s\n%s\n%s\n%s\n\n", appointment.date, appointment.start_time, appointment.finish_time, appointment.title, appointment.place, appointment.meet);
    
        fclose(fp1);
    So what's going on?
    Last edited by JM1082; 03-24-2011 at 01:07 PM. Reason: A few small changes, unrelated to original problem! ;-)

  2. #2
    Registered User
    Join Date
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    Long Beach, CA
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    5,676
    Do you use another method besides fgets to get user input in another part of your program? There's a good change you have a newline still stuck in the input buffer when you call appointment(). See if this helps: Cprogramming.com FAQ > Flush the input buffer.

  3. #3
    a_capitalist_story
    Join Date
    Dec 2007
    Posts
    2,655
    Don't forget...fgets() includes the terminating newline in the buffer you're reading into. You probably should read into a buffer you reuse and copy the data without the newline into the target variable.

  4. #4
    Registered User
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    Location
    Toronto, Canada
    Posts
    1,832
    You realize that your last fprintf has 6 arguments but only 4 formatter thingies.

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