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Full Discussion: Very strange output with casting
Top Forums Programming Very strange output with casting Post 303029297 by arunkumar_mca on Thursday 24th of January 2019 01:13:05 PM
Old 01-24-2019
Very strange output with casting
Hi All,

I am having a strange issue. Below is the code snippet. If I print
Code:
fraction * (double)::pow((double)10,scalingFactor)

which is a double I am getting 154 when I type cast that to
Code:
int

as
Code:
(int)( ((fraction) * ((double)::pow((double)10,scalingFactor))))

it is becoming 153. Not sure why casting get me different output. Also for another strange thing is if store the
Code:
fraction * (double)::pow((double)10,scalingFactor)

into a double and then type cast it returning me 154.

Code:
////////////////////////////////////////////////////////////////////////////////
std::string floatToString(double fvalue, int valueLength, int scalingFactor)
{
double i = 0;
double fraction = modf(fvalue, &i);
int intpart = (int)i;
double returnValue = fraction * (double)::pow((double)10,scalingFactor);

std::stringstream ss;
ss	<< std::setfill('0')
<< std::setw(valueLength-scalingFactor)
<< intpart;
ss	<< std::setfill('0')
<< std::setw(scalingFactor)
 << (int)( ((fraction) * ((double)::pow((double)10,scalingFactor))));


std::cout << " VALUE = " << fvalue << " | scalingFactor = " << scalingFactor 
<< " | fraction= " << fraction << " | ss.str() = " << ss.str() 
<< " | ::pow((double)10.0,scalingFactor) = "<< ::pow((double)10.0, scalingFactor) 
<<" | fraction * (double)::pow((double)10.0,scalingFactor) = "<< fraction * (double)::pow((double)10.0, scalingFactor) 
<<" | (int)(fraction * (double)::pow((double)10.0,scalingFactor)) = "<< (int)(fraction * (double)::pow((double)10.0, scalingFactor)) 
<< " | returnValue = "<< (int)returnValue 
<< " | TESTOUTPUT =" << (int)( ((fraction) * ((double)::pow((double)10,scalingFactor))))
<< std::endl;

return ss.str();
}

OUTPUT:

VALUE = 0.154 |
scalingFactor = 3 | 
fraction= 0.154 | 
ss.str() = 000153 | 
::pow((double)10.0,scalingFactor) = 1000 | 
fraction * (double)::pow((double)10.0,scalingFactor) = 154 |
(int)(fraction * (double)::pow((double)10.0,scalingFactor)) = 153 |
returnValue = 154 | TESTOUTPUT=153

 

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LEARN ABOUT OSX

powf

POW(3)							   BSD Library Functions Manual 						    POW(3)

NAME

     pow -- power function

SYNOPSIS

     #include <math.h>

     double
     pow(double x, double y);

     long double
     powl(long double x, long double y);

     float
     powf(float x, float y);

DESCRIPTION

     The pow() functions compute x raised to the power y.

SPECIAL VALUES

     pow(+-0, y) returns +-infinity and raises the "divide-by-zero" floating-point exception for y an odd integer < 0.

     pow(+-0, y) returns +infinity and raises the "divide-by-zero" floating-point exception for y < 0 and not an odd integer.

     pow(+-0, y) returns +-0 for y an odd integer > 0.

     pow(+-0, y) returns +0 for y > 0 and not an odd integer.

     pow(-1, +-infinity) returns 1.

     pow(1, y) returns 1 for any y, even a NaN.

     pow(x, +-0) returns 1 for any x, even a NaN.

     pow(x, y) returns a NaN and raises the "invalid" floating-point exception for finite x < 0 and finite non-integer y.

     pow(x, -infinity) returns +infinity for |x| < 1.

     pow(x, -infinity) returns +0 for |x| > 1.

     pow(x, +infinity) returns +0 for |x| < 1.

     pow(x, +infinity) returns +infinity for |x| > 1.

     pow(-infinity, y) returns -0 for y an odd integer < 0.

     pow(-infinity, y) returns +0 for y < 0 and not an odd integer.

     pow(-infinity, y) returns -infinity for y an odd integer > 0.

     pow(-infinity, y) returns +infinity for y > 0 and not an odd integer.

     pow(+infinity, y) returns +0 for y < 0.

     pow(+infinity, y) returns +infinity for y > 0.

     A domain error occurs if x is finite and negative and y is finite and not an integer.

     A domain error can occur if x is 0 and y less than or equal to 0.

     Range errors may occur.

VECTOR OPERATIONS

     If you need to apply the pow() functions to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may
     give significantly better performance:

     #include <Accelerate/Accelerate.h>

     vFloat vpowf(vFloat x, vFloat y);
     vFloat vpowf(vFloat x, vSInt32 y);
     void vvpowf(float *z, const float *y, const float *x, const int *n);
     void vvpow(double *z, const double *y, const double *x, const int *n);
     void vvpowsf(float *z, const float *y, const float *x, const int *n);
     void vvpows(double *z, const double *y, const double *x, const int *n);

SEE ALSO

     exp(3) math(3)

STANDARDS

     The pow() function conforms to ISO/IEC 9899:2011.

4th Berkeley Distribution					 December 11, 2006					 4th Berkeley Distribution
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