simple program 2

This is a discussion on simple program 2 within the C Programming forums, part of the General Programming Boards category; ok below is a sample program I used to multiple 2 numbers the numbers can be more than 1 digit,. ...

  1. #1
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    simple program 2

    ok below is a sample program I used to
    multiple 2 numbers the numbers can be
    more than 1 digit,. I know its long winded
    and the functions are not needed but I was
    just trying to get to grips with different
    things as im used to delphi. the program
    has one problem when it asks if you want
    to try again the program ends and does not
    wait for input, im guessing there is still
    something in the input buffer. Can you
    have a look and tell me how this could be
    fixed and if theres anyhting else I should
    have done different? code exmaples would be
    great.

    Thanks.

    Code:
     
    #include <stdio.h>
    
    int  intAnswr(int,int);
    char chrRpt (int);
    
    int main ()
    
    {
       int intN1,intN2;
       int intFst;
    
       intN1 = 0;
       intN2 = 0;
       intFst = 0;
    
       while (chrRpt(intFst) == 'Y')
       {
          intFst = 1;
          printf ("\nEnter First No.  : ");
          scanf ("%d",&intN1);
          printf ("Enter Second No. : ");
          scanf ("%d",&intN2);
          printf ("\n%d * %d = %d\n",intN1,intN2,intAnswr(intN1,intN2));
       }
    }
    
    
    char chrRpt(int intRun)
    {
    char chrTmp='Y';
       if (intRun != 0)
       {
          printf("Try Again? Y/N");
          scanf ("%c",&chrTmp);
       }
       return (chrTmp);   
    }
    
    
    int intAnswr(int n1,int n2)
    {
       return(n1 * n2);
    }
    Last edited by Gav D; 08-05-2003 at 03:32 AM.

  2. #2
    Comment your source code! Lynux-Penguin's Avatar
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    use:
    Code:
    fgetc(stdin,mychar);
    instead of scanf

    -LC
    Asking the right question is sometimes more important than knowing the answer.
    Please read the FAQ
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  3. #3
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    Do like this: U will understand the problem.

    Enter first no: Enter any thing here (let 2)
    Enter second no: Y /* Enter 'Y' Here*/

    2 * 0 = 0

    Try Again? Y/N
    Enter First No. :


    understood...scanf doent clear the buffer.

  4. #4
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    the first 2 scanfs work fine if I enter 4 then 5 it comes out with 4*5 it just doesnt work on the try again one? can you show me in my code what I need to change? other than the scanfs does everything else look ok ? Im trying not to get into any bad habbits thats why im checking this with you lot.

  5. #5
    Obsessed with C chrismiceli's Avatar
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    why use fgetc(stdin, varname) instead of getchar()?

  6. #6
    Comment your source code! Lynux-Penguin's Avatar
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    i dunno, just because, no particular reason. I just like it. I mean how cool is that 'f' in front. You can post it on a C++ board and the guys who don't know C would be like, "oh, whats that?" LOL

    j/k

    or you could just use fflush(stdin) (freaky dissonant piano music plays and lightning strikes) Just kidding, DONT DO THIS.

    use whatever u want, I just like fgetc()

    PS: See C_Refrence_Card in my Signature

    -LC
    Last edited by Lynux-Penguin; 08-05-2003 at 01:08 PM.
    Asking the right question is sometimes more important than knowing the answer.
    Please read the FAQ
    C Reference Card (A MUST!)
    Pointers and Memory
    The Essentials
    CString lib

  7. #7
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    ok so other than that the concepts look ok? also intFST was initialised just a bit further down

  8. #8
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    also sorry to sound stupid but can some explain this

    while ( getchar() != '\n' );

    is this clearing out the buffer? im guess getchar is taking the contents ofthe input buffer one by one until it reaches the end?

    also as its while with a semi colon at the end does that mean the next statement is not included in the loop?
    Last edited by Gav D; 08-06-2003 at 01:15 AM.

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