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Full Discussion: Help please...output problems with printf.
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
Old 10-19-2008
Error 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.
 

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LEARN ABOUT DEBIAN

sbcylinder

SbCylinder(3)							       Coin							     SbCylinder(3)

NAME

       SbCylinder -

       The SbCylinder class is a representation of a cylinder.

       This class is used within other classes in Coin. It contains data to represent a cylinder by an axis and a radius. The cylinder has no
       length/height value, which means it is treated as of infinite length.

SYNOPSIS

       #include <Inventor/SbLinear.h>

   Public Member Functions
       SbCylinder (void)
       SbCylinder (const SbLine &a, const float r)
       void setValue (const SbLine &a, const float r)
       void setAxis (const SbLine &a)
       void setRadius (const float r)
       const SbLine & getAxis (void) const
       float getRadius (void) const
       SbBool intersect (const SbLine &l, SbVec3f &intersection) const
       SbBool intersect (const SbLine &l, SbVec3f &enter, SbVec3f &exit) const
       void print (FILE *file) const

Detailed Description
       The SbCylinder class is a representation of a cylinder.

       This class is used within other classes in Coin. It contains data to represent a cylinder by an axis and a radius. The cylinder has no
       length/height value, which means it is treated as of infinite length.

       See also:
	   SbLine, SbSphere

Constructor &; Destructor Documentation
   SbCylinder::SbCylinder (void)
       The default constructor will make a cylinder of radius 1, center axis going through origo in the parallel direction of the positive y-axis.

   SbCylinder::SbCylinder (const SbLine &a, const floatr)
       Construct and initialize an SbCylinder instance with the given axis a and radius r.

Member Function Documentation
   void SbCylinder::setValue (const SbLine &a, const floatr)
       Set the axis and radius of the cylinder.

       See also:
	   getAxis(), getRadius().

   void SbCylinder::setAxis (const SbLine &a)
       Set the center axis of the cylinder.

       See also:
	   setRadius(), getAxis().

   void SbCylinder::setRadius (const floatr)
       Set the radius of the cylinder.

       See also:
	   setAxis(), getRadius().

   const SbLine & SbCylinder::getAxis (void) const
       Return the line which is the center axis of the cylinder.

       See also:
	   setAxis(), getRadius().

   float SbCylinder::getRadius (void) const
       Return radius of cylinder.

       See also:
	   setRadius(), getAxis().

   SbBool SbCylinder::intersect (const SbLine &l, SbVec3f &intersection) const
       Finds the intersection point of the ray l on the cylinder where the ray enters, and return this point in intersection.

       If the ray does not intersect the cylinder, FALSE is returned, otherwise we will return TRUE.

   SbBool SbCylinder::intersect (const SbLine &l, SbVec3f &enter, SbVec3f &exit) const
       Find the intersection points of the ray l on the cylinder and return these in enter and exit. If the ray just 'grazes' the cylinder, the
       enter and exit points have equal values.

       If the ray does not intersect the cylinder, FALSE is returned, otherwise we will return TRUE.

   void SbCylinder::print (FILE *fp) const
       Dump the state of this object to the file stream. Only works in debug version of library, method does nothing in an optimized compile.

Author
       Generated automatically by Doxygen for Coin from the source code.

Version 3.1.3							  Wed May 23 2012						     SbCylinder(3)
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