Comments on: 2.5 — Floating point numbers

By: C++ Tutorial and Online Ebook

C++ Tutorial and Online Ebook — Wed, 30 Jun 2010 01:10:01 +0000

[...] 2.5 Floating point numbers [...]

By: supriya

supriya — Wed, 28 Apr 2010 09:50:18 +0000

/* Program to know real value of fTotal */

#include 
#include 

void main()
{
clrscr();

float fValue1 = 1.345f;
float fValue2 = 1.123f;
float fTotal = fValue1 + fValue2; // should be 2.468

if (fTotal == 2.468f) // use 2.468f,it will work properly.
{
cout << "n fTotal is 2.468";
}
else
{
cout << "n fTotal is not 2.468";
}

printf("n The real value of fTotal is %0.7f", fTotal);
getch();
}

/* End of Pgram */

By: SleepyHead

SleepyHead — Thu, 25 Feb 2010 09:45:02 +0000

I’m confused by your use of the term ‘real number’.

In mathematics a real number is any number which isn’t an imaginary number, which means that both C++ integer and floating-point data-types can hold real numbers, and the only difference between them is that floating-point data-types can represent decimal fractions, as opposed to integer data-types which can only hold natural numbers (aka counting numbers, or whole numbers).

Also – a general stylistic point – you’ve often used “it’s” where “its” is the correct word to use, cf. http://www.buckingham.ac.uk/english/guide/its.html.

By: Toni

Toni — Tue, 19 Jan 2010 00:08:19 +0000

hi there, can you give me an example of addition with no outputs?

By: sanjiv

sanjiv — Mon, 12 Oct 2009 06:22:30 +0000

 
 int intVar = 1500000000; 1st instance needs to be declared correctly as

 unsigned int intVar = 1500000000;

Gets the desired results... on compiling

Guess all authors are prone to typo errors.

By: sanjiv

sanjiv — Thu, 08 Oct 2009 07:22:02 +0000

your C ++ compiler has a tendency to roundoff 8th precision onwards.
For any value lesser then 8;
It will display 1 lesser than called for.

By: sanjiv

sanjiv — Wed, 07 Oct 2009 05:50:26 +0000

 
# include 

using namespace std;
                
                int main()
                          {
                           int intVar = 1500000000;
                           intVar = (intVar * 10) / 10;
                           cout << "intVar :"  << intVar << endl; 
                           
                           intVar = 1500000000;
                           intVar = (static_cast(intVar) * 10) / 10;
                           cout << "intVar :" << intVar << endl;  
                           
                           system("pause");
                           return 0;     
                          }
/*devc++ 4.9.9.2 compiler instead of printing error 
value is displaying assigned value directly in the first
 instance.where am I going wrong OR is the new 
DEV C++ compiler which is the responsible for this... */

By: jeremy

jeremy — Tue, 01 Sep 2009 02:32:32 +0000

In decimal, .1 is tenths, .01 is hundredths, .001 is thousandths and so on. Likewise, in binary, .1 is halves, .01 is quarters, .001 is eights, and so on.
0.000110011… would be equal to 1/16 + 1/32 + 1/256 + 1/512 + …

By: Slade

Slade — Mon, 20 Jul 2009 01:52:33 +0000

Sorry after include it is suppsed to say io stream in angled brackets

By: Slade

Slade — Mon, 20 Jul 2009 01:51:07 +0000

In the code example right after “rounding errors,” why is there no “#include ” when there is a cout later and also “using namespace std”? Is it a miss type or is there a reason…?