Revised Slope formula

This is a discussion on Revised Slope formula within the C Programming forums, part of the General Programming Boards category; I think this should work, but i can get it to work. Anyone got any ideas on why it is ...

  1. #1
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    Revised Slope formula

    I think this should work, but i can get it to work. Anyone got any ideas on why it is not working..??
    ------------------------------------------------------------------------------

    #include <stdio.h>
    #include <conio.h>
    main()
    {
    int x1, y1, x2, y2, m ;

    printf ( "To find the slope of your line enter the following: \n" ) ;

    printf ( "The First set of points. eg. (x,y) \n" ) ;
    scanf ( "%d" , &x1 ) ;
    scanf ( "%d" , &y1 ) ;

    printf ( "The Second set of points. eg. (x,y) \n" ) ;
    scanf ( "%d" , &x2 ) ;
    scanf ( "%d" , &y2 ) ;

    m = ( y2 - y1 ) / (x2 - x1) ;

    printf ( "The slope is %d \n" ,m ) ;

    getch () ;
    }
    -----------------------------------------------------------------------------
    Dangerous Dave

  2. #2
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    Try replacing your 2 scanf's for each points with one
    scanf("%d %d", &x1, &y1);
    Have a space between your numbers and you should be fine

  3. #3
    Ethereal Raccoon Procyon's Avatar
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    You should also use a float, rather than an int, for the slope variable, and typecast (y2-y1) to a float.

  4. #4
    & the hat of GPL slaying Thantos's Avatar
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    Also you may want to do a check for a divide by zero. Remember if your line is vertical then you have an undefined slope. I don't remember how C handles dividing by zero.

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