Real quick C++ question

[Gooberlx2]

How do I get the value 'e'? (as in log 'e' x would be natural log of x)

Is it in the stl? 'cause I can't find it.

Thx

 

[Gooberlx2]

^^

I know somebody out there knows

 

[chiwawa626]

Isnt e a specified number, can u just define e=231231231j2371280rufqidfjai in ur prog?

 

[Ameesh]

look in math.h it should be defined as a constant in there, im pretty sure pi is ther also.

 

[chiwawa626]

yeah its E = 2.7182818284590452354
I looked on google and its in some math.h's

 

[20_MuleTeam_Borax]

<< yeah its E = 2.7182818284590452354
I looked on google and its in some math.h's >>



It's not exactly that. e is a non-repeating decimal. it is defined as the limit of (1+n)^1/n as n approaches 0. there should be a much more accurate value defined for you somewhere.

 

[Mr.IncrediblyBored]

Perhaps I'm not understanding something but the exp() function supposedly returns e^x where x is the value passed to the function. Couldn't you simply pass 1 to the function? It would return e^1 or just e, wouldn't it?

 

[Ameesh]

<< Perhaps I'm not understanding something but the exp() function supposedly returns e^x where x is the value passed to the function. Couldn't you simply pass 1 to the function? It would return e^1 or just e, wouldn't it? >>



why make it even that complicated, the constant is defined in math.h just include it and use it.

 

[Mr.IncrediblyBored]

<< why make it even that complicated, the constant is defined in math.h just include it and use it. >>


Pardon my ignorance. I've never needed to use e before. Is the constant just 'E'?

 

[Platypus]

<< look in math.h it should be defined as a constant in there, im pretty sure pi is ther also. >>

 

[Rahminator]

#include <cmath>

This imports various things, among which is a symbolic constant M_E set to 2.71828182845904523536.

 

[Bluga]

I also have some easy C question, please help me out.


#1: Will the following print to file or stdout?

fprintf(stdout, "vertices=%d", graph(graph));

#2: Are these two the same?

int main (int argc, char **argv)

int main (int argc, char argv[])

#3: The following is a pointer to void, but what does it mean?

void *data