Need Help With EOF

This is a discussion on Need Help With EOF within the C Programming forums, part of the General Programming Boards category; Can anyone tell me why the EOF (allowing the user to enter F6 or Ctrl Z) may not be working ...

  1. #1
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    Need Help With EOF

    Can anyone tell me why the EOF (allowing the user to enter F6 or Ctrl Z) may not be working for me? I have a loop running "while(input != EOF)". Any help is greatly appreciated.

  2. #2
    Code Goddess Prelude's Avatar
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    I can't tell without seeing more code, it could be that you're trying to read characters and your input variable is declared as char. Since EOF has a value that can't be held by char you would need to use int instead.

    Post your code and I'll be able to tell you more

    -Prelude
    My best code is written with the delete key.

  3. #3
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    Prelude -- Portion of Code

    Below is my code from main, I have functions below it that I did not copy here, but this will show you what I am trying to do. I appreciate the help!

    //Function Prototypes
    void display_header();

    int main()
    {

    //Declare variables
    char input;
    char operation;
    double num1;
    double num2;
    double result;

    //Prototype functions
    double product(double, double);
    double quotient(double, double);
    double sum(double, double);
    double difference(double, double);

    //Call function
    display_header();

    //Prompt user to begin
    printf("Press enter to begin the program.");
    fflush(stdin);
    scanf("%c", &input);
    fflush(stdin);

    while (input != EOF)
    {

    //Clear screen
    system("cls");

    //Prompt user for numbers
    printf("Enter your first number: ");
    scanf("%lf", &num1);
    fflush(stdin);
    printf("Enter your second number: ");
    scanf("%lf", &num2);
    fflush(stdin);

    //Clear screen
    system("cls");

    //Prompt user for operation
    printf("Choose:\n");
    printf("'*' for the product\n");
    printf("'/' for the quotient\n");
    printf("'+' for the sum\n");
    printf("'-' for the difference\n\n");
    printf("What operation would you like to perform: ");
    fflush(stdin);
    scanf("%c", &operation);

    //Evaluate operation chosen and call appropriate function
    if (operation == '*')
    result = product(num1, num2);
    else if (operation == '/')
    result = quotient(num1, num2);
    else if (operation == '+')
    result = sum(num1, num2);
    else if (operation == '-')
    result = difference(num1, num2);
    else
    printf("Invalid choice!\n\n");

    //Prompt user to continue
    printf("Press enter to continue program.");
    fflush(stdin);
    scanf("%c", &input);
    }

    return 0;
    }

  4. #4
    Code Goddess Prelude's Avatar
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    >char input;
    change that to
    int input;
    and you should be able to use EOF. EOF is a value too big for a char, so to test for it you need to use an int. It's a tough bug to find unless you know what you're looking for. Kinda goofy, but that's life

    -Prelude
    My best code is written with the delete key.

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