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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LEARN ABOUT MOJAVE

glucylinder

GLUCYLINDER(3G) 														   GLUCYLINDER(3G)

NAME

       gluCylinder - draw a cylinder

C SPECIFICATION

       void gluCylinder( GLUquadric* quad,
			 GLdouble base,
			 GLdouble top,
			 GLdouble height,
			 GLint slices,
			 GLint stacks )

PARAMETERS

       quad    Specifies the quadrics object (created with gluNewQuadric).

       base    Specifies the radius of the cylinder at z = 0.

       top     Specifies the radius of the cylinder at z = height.

       height  Specifies the height of the cylinder.

       slices  Specifies the number of subdivisions around the z axis.

       stacks  Specifies the number of subdivisions along the z axis.

DESCRIPTION

       gluCylinder  draws  a  cylinder	oriented  along the z axis. The base of the cylinder is placed at z = 0, and the top at z = height. Like a
       sphere, a cylinder is subdivided around the z axis into slices, and along the z axis into stacks.

       Note that if top is set to 0.0, this routine generates a cone.

       If the orientation is set to GLU_OUTSIDE (with gluQuadricOrientation), then any generated normals point away from the  z  axis.	Otherwise,
       they point toward the z axis.

       If  texturing  is turned on (with gluQuadricTexture), then texture coordinates are generated so that t ranges linearly from 0.0 at z = 0 to
       1.0 at z = height, and s ranges from 0.0 at the +y axis, to 0.25 at the +x axis, to 0.5 at the -y axis, to 0.75 at the -x axis, and back to
       1.0 at the +y axis.

SEE ALSO

       gluDisk, gluNewQuadric, gluPartialDisk, gluQuadricTexture, gluSphere

																   GLUCYLINDER(3G)