about precision and format

[glassy]

two questions:
in the GMP manual : 
mpf_set_default_prec (unsigned long int prec) : sets the default precision to be at least prec bits.
okay if we want the precision 2048 bits, how may digits will be at the right of the mantissa if we want a decimal number ?
second question: in the gmp_sprintf(s, "%77.72Fe" , @r)  what is the meaning of the format string  "%77.72Fe"  how could we interpret it.
and also gmp_sprintz(s, "%Zd" , @r)   how could we intepret the string "%Zd"
thanks
glassy
   

 		
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