Float error or a Format error ??

[glassy]

hi
  x=1.2
mpf_pow_ui(result,x,22)
mp_sprintf(stringVar,"%.30Ff",result) 
the displayed result will be:
55.206143891243641727800000000000
while the true result must be :
55.2061438912436417593344
using gmp-v4.2
please explain
   

 		
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