Thread: fgets() and structures issue

  1. #1
    Registered User
    Join Date
    Dec 2006

    fgets() and structures issue

    I am having a problem with fgets() waiting for stdin. Any help is appreciated.

    #include <stdio.h>
    struct myPIM
       char firstname[15];
       char lastname[20];
       char homeaddr[30];
       char city[30];
       char state[3];
       long int zip;
       struct myPIM person1;
       printf("Person # 1\n");
       printf("Firstname: ");
       scanf("%s", person1.firstname);
       printf("Lastname: ");
       scanf("%s", person1.lastname);
       printf("Street Address: ");
       fgets(person1.homeaddr, 30, stdin);
       printf("City: ");
       printf("State: ");
       scanf("%s", person1.state);
       printf("Zipcode: ");
       scanf("%ld", &;
       /* print the entered information */
       printf("\n\n*** Your Personal Information ***\n");
       printf("Firstname: %s\n", person1.firstname);
       printf("Lastname: %s\n", person1.lastname);
       printf("Street Address: %s\n", person1.homeaddr);
       printf("City: %s\n",;
       printf("State: %s\n", person1.state);
       printf("ZipCode: %ld\n",;

  2. #2
    Cat without Hat CornedBee's Avatar
    Join Date
    Apr 2003
    scanf leaves newlines in the stream, causing fgets to pick it up and think it's done. Call fgetc(stdin) to eat the newline.
    All the buzzt!

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  3. #3
    Registered User
    Join Date
    Dec 2006

    Thumbs up

    cool thanks for the fast reply. I appreciate it.

  4. #4
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Or better yet, use

    char buff[BUFSIZ];
    fgets( buff, sizeof buff, stdin );
    To read each line of input.

    When you've validated the data, then convert / copy / whatever the data into your struct.

    Ad-hoc reading directly into the struct without validation is no way to go.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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