rop?

[Daniel J Farrell]

Hello everybody,

I'm a little curious about the 'rop' the keeps appearing in all the  
fuction definitions. There is alway advice in to what to set it do  
but after searching the gmp manual I could find anything that  
explains it?

For example the floating point power function.

void mpf_pow_ui (mpf_t rop, mpf_t op1, unsigned long int op2 )
Set rop to op1 op2 .

Regards, Daniel.