error handling question

This is a discussion on error handling question within the C Programming forums, part of the General Programming Boards category; below is a exerpt of what I have for them to enter the input for the matrix. I am attempting ...

  1. #1
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    Sep 2002
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    1

    error handling question(code in post)

    below is a exerpt of what I have for them to enter the input for the matrix. I am attempting to be able to stop the error, when the person enters a number it works, but when they enter a chara it spams out text till the end not allowing anymore user input. Is there any script of code I could use to check each one before it caused a problem or maybe not use floating as my input. Not sure if this is to broad but thanks for the help if you can.


    printf("Please start entering the terms of the first matrix below.\n");

    printf("Matrix 1 row 1 colum 1: ");
    scanf( "%f", &array_a[0][0]);
    printf("Matrix 1 row 1 colum 2: ");
    scanf( "%f", &array_a[0][1]);
    printf("Matrix 1 row 1 colum 3: ");
    scanf( "%f", &array_a[0][2]);
    printf("Matrix 1 row 2 colum 1: ");
    scanf( "%f", &array_a[1][0]);
    printf("Matrix 1 row 2 colum 2: ");
    scanf( "%f", &array_a[1][1]);
    printf("Matrix 1 row 2 colum 3: ");
    scanf( "%f", &array_a[1][2]);
    printf("Matrix 1 row 3 colum 1: ");
    scanf( "%f", &array_a[2][0]);
    printf("Matrix 1 row 3 colum 2: ");
    scanf( "%f", &array_a[2][1]);
    printf("Matrix 1 row 3 colum 3: ");
    scanf( "%f", &array_a[2][2]);
    Last edited by plexis; 09-30-2002 at 08:49 PM.

  2. #2
    ATH0 quzah's Avatar
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    That's because you're using scanf, which leaves the newline in the buffer. You need something like:
    Code:
    void clearstdin( void )
    {
        while(fgetc(stdin)!='\n');
    }
    This basicly will pull all input upto and including the newline from the buffer. So after you use scanf, do:

    scanf( "%d", &myvar );
    clearstdin( );

    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    CS Author and Instructor
    Join Date
    Sep 2002
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    511
    Why don't you use loops to enter the values into the array?
    It would make your code alot shorter.

    Mr. c.

  4. #4
    Registered User Seek n Destroy's Avatar
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    Sep 2002
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    I think you could use...
    scanf("%[1234567890]f",&store);

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