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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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