C++ question, number display

[racronus]

I'm doing a trig function program. what is the actual value of this: -9.25596e+061 ?

[qball]

er, aaa, er. That is the value.


-9.25596e+061


It's scientific notation.

http://www.ugrad.math.ubc.ca/coursedoc/math100/notes/derivative/exp2.html

So basically:

-9.26 times 'e' raised to the 61st power.

[racronus]

thanks for the reply, that was guess but the +0 threw me off. I guess it meant possitive, still not sure why the 0 is there, maybe the programing software?

[qball]

"+061", "+61", whatever...


seems the same to me, mathematically (sp?). The '0' may imply a level of precision greater than no '0'...

[Rhino302]

What data type are you using for that number?

[gfunkmartin]

-9.26 times 'e' raised to the 61st power.

qball, I am going to have to gainsay your knowledge here. I believe that the value is actually -9.26... x 10 ^ 61 (instead of e^61). It's easy to see where the mistake was made, but scientific notation is k * 10^n, where 1 <= k < 10. The e is just a shorthand for scientific notation.

Jason

Rhino -
Here's the possible data types for the number:
[unsigned] [long] float
[unsigned] [long] double

[qball]

The e is just a shorthand for scientific notation.


Actually, you may be true, but it would be a typo, methinks, as:

'E' is shorthand for scientific notation.

http://java.sun.com/j2se/1.4/docs/api/java/text/DecimalFormat.html

http://www.nyu.edu/pages/mathmol/textbook/scinot.html

Seeing it is a trig function, 'e, the natural log' could be valid and shouldn't be discounted without further info...

[gfunkmartin]

It may be a trig function, but remember that we're still dealing with C++ here. And unless I misread the post, all that racronus did was output the value, probably something like:

float some_value;

cout << some_value;

If some_value was a small number, it probably would be output in scientific notation. And I've seen scientific notation using both the capital E and the lower-case e

Jason

[qball]

without further info...


would be helpful.


dealing with C++ here


Maybe, but, dealing with notation. Language independent.


I've seen scientific notation using both the capital E and the lower-case e


So have I.

Show me a trig function, using 'e', with output in 'e' units

I've seen people drive slow in the fast lanes...

[gfunkmartin]

I've seen people drive slow in the fast lanes...

I hate it when that happens lol :)

[gfunkmartin]

qball,

I just took the time to compile and run a very short program.

Here's the source I used:

#include <iostream>

int main() {

float x = 10000000000000;

cout << "x = " << x << endl;

return 0;
}


And here's the output:

$ ./a.out
x = 1e+13

Jason