Significant digits

[pw]

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?

// 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;
}

 

[Josephine Schafer]

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.

 

[John H. Guillory]

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?

// 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;[/QUOTE]



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....