GMP rounding algorithm

[LiuEmma]

Hi,

 

I have a question about the rounding algorithm of GMP.

 

This is part of my code:

 

mpf_t f;

char* pchStr = "99999999985";

mpf_init_set_str (f,pchStr,10);
char *ch = mpf_get_str(NULL,&exp,10,10,f);

 

 

The reuslt is supposed to be

ch = "9999999999"

 

but actually it is "9999999998"

 

Would anybody tell me why and which rounding algorithm the gmp lib uses?

 

Regards,

Emma

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