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pw
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 Posted: Thu Jun 26, 2003 4:43 am Post subject: Significant digits |
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Running this on MSWin2000 PC, I show 6 only digits for float and double.
i.e. l_float and l_double show 33333.1 (6 only digits).
Is it possible to increase/alter this?
[code]
// Test ints, floats and doubles
#include <iostream>
using namespace std;
int main()
{
int l_int;
float l_float;
double l_double;
l_int = 33333.1415922662266;
l_float = l_int;
l_double = l_int;
cout << "Define int: " << l_int << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
l_float = 33333.1415922662266;
l_int = l_float;
l_double = l_float;
cout << "Define float: " << l_float << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
l_double = 33333.1415922662266;
l_int = l_double;
l_float = l_double;
cout << "Define double: " << l_double << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
l_double = 333333333.1415922662266;
l_int = l_double;
l_float = l_double;
cout << "Define double: " << l_double << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
return 0;
}
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Josephine Schafer
Guest
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| Posted: Thu Jun 26, 2003 4:57 am Post subject: Re: Significant digits |
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"pw" <no_email_delete_ (AT) bigpond (DOT) net> wrote
| Quote: | Running this on MSWin2000 PC, I show 6 only digits for float and double.
i.e. l_float and l_double show 33333.1 (6 only digits).
Is it possible to increase/alter this?
Sure. std::setprecision () is what you are looking for. |
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John H. Guillory
Guest
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| Posted: Sun Jun 29, 2003 11:18 am Post subject: Re: Significant digits |
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On Thu, 26 Jun 2003 04:43:52 GMT, "pw" <no_email_delete_ (AT) bigpond (DOT) net>
wrote:
| Quote: | Running this on MSWin2000 PC, I show 6 only digits for float and double.
i.e. l_float and l_double show 33333.1 (6 only digits).
Is it possible to increase/alter this?
[code]
// Test ints, floats and doubles
#include
using namespace std;
int main()
{
int l_int;
float l_float;
double l_double;
l_int = 33333.1415922662266;
l_float = l_int;
l_double = l_int;
cout << "Define int: " << l_int << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
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If you even get the .1, your compiler must be whacked out.... Consider
what you are doing here.... Storing a decimal number into an int
(I_int), results in I_int equal to 33333. I_float then gets that
value stored into it. (33333). I_double, then gets the 33333 stored
into it.... Consider changing it to:
I_double = 33333.1415922662266;
I_float = I_double;
I_int = I_float;
etc, then printing it and you should then notice better accuracy....
| Quote: |
l_float = 33333.1415922662266;
l_int = l_float;
l_double = l_float;
cout << "Define float: " << l_float << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
l_double = 33333.1415922662266;
l_int = l_double;
l_float = l_double;
cout << "Define double: " << l_double << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
l_double = 333333333.1415922662266;
l_int = l_double;
l_float = l_double;
cout << "Define double: " << l_double << endl;
cout << "l_int: " << l_int << endl;
cout << "l_float: " << l_float << endl;
cout << "l_double: " << l_double << endl;
cout << endl;
return 0;
}
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