Help please...output problems with printf. Post: 302248756

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Top Forums UNIX for Advanced & Expert Users Help please...output problems with printf. Post 302248756 by pwanda on Sunday 19th of October 2008 02:51:23 PM

10-19-2008

Registered User

Help please...output problems with printf.

Code:

#include <stdio.h>
#include <math.h>

// this function calculates the volume of a Cylinder
int main(void)
{
    int r;    // radius
    int h;    // height
    double M_PI; // pi
    
    int pOne = pow (r, 2);  
    
    // get user input of radius and height
    printf ("Enter your radius: ");
    scanf ("%f", &r);
    printf ("Enter your height: ");
    scanf ("%f", &h);

    // calculate volume
    
    volumeCylinder = pOne * M_PI * h;

    // output volume result
    
    printf ("The Volume of the Cylinder is: %lf\n", volumeCylinder);

    return 0;

}

Sample Output:

Code:

~Enter your radius: 3
~Enter your height: 2
~The Volume of the Cylinder is: 0.000000
~

The program compiles and runs but no matter what kind of printf format I do (double, float, int) I always get 0.0000..., -0.000..., or some really large number.

I don't know what could be wrong. Can anybody please help me with this? It is driving me insane.

pwanda

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goo::canvas::ellipsemodel

Goo::Canvas::EllipseModel(3pm)				User Contributed Perl Documentation			    Goo::Canvas::EllipseModel(3pm)

NAME

       Goo::Canvas::EllipseModel - wrapper for GooCanvasEllipseModel

HIERARCHY

	 Glib::Object
	 +----Goo::Canvas::ItemModelSimple
	      +----Goo::Canvas::EllipseModel

INTERFACES

	 Goo::Canvas::ItemModel

METHODS

   itemmodel = Goo::Canvas::EllipseModel->new ($parent, $center_x, $center_y, $radius_x, $radius_y, ...)
       o   $parent (Goo::Canvas::ItemModel)

       o   $center_x (double)

       o   $center_y (double)

       o   $radius_x (double)

       o   $radius_y (double)

       o   ... (list)

PROPERTIES

       'center-x' (double : default 0 : readable / writable)
	   The x coordinate of the center of the ellipse

       'center-y' (double : default 0 : readable / writable)
	   The y coordinate of the center of the ellipse

       'height' (double : default 0 : readable / writable)
	   The height of the ellipse

       'radius-x' (double : default 0 : readable / writable)
	   The horizontal radius of the ellipse

       'radius-y' (double : default 0 : readable / writable)
	   The vertical radius of the ellipse

       'width' (double : default 0 : readable / writable)
	   The width of the ellipse

       'x' (double : default 0 : readable / writable)
	   The x coordinate of the left side of the ellipse

       'y' (double : default 0 : readable / writable)
	   The y coordinate of the top of the ellipse

SEE ALSO

       Glib::Object, Goo::Canvas::ItemModelSimple

COPYRIGHT

       Copyright (C) 2011 Gtk2-Perl Team

perl v5.14.2							    2011-11-16					    Goo::Canvas::EllipseModel(3pm)