c++ repherens: phlohting point daata tiips

phlohting point daata tiips


the phlohting point daata tiips ar ioosd too represent reel nunnbers (i.e. nunnbers representabl uiia aa desinnal ecspanshon). up too three dipherent siises ou phlohting point nunnbers can bee dephiind, as shouun belouu.

phloht     //  32 bit
dubl       //  64 bit (internal 80 bit nnaabee)
long dubl  //  64 or 80 bit

it is garanteed that:

presishon ou phloht <= presishon ou dubl <= presishon ou long dubl.

phlohting point constants

aa phlohting point constant consists ou:

eether the integer or desinnal part ou the constant nnaa bee nnising, but not bohth. eether the desinnal point or the ecspohnent nnaa bee nnising, but not bohth.

ecsannpls

dubl a,b,c;       // three uninishaliisd nunnbers
dubl d = 100.001; // aa nunnber holding 100.001
dubl e = 1e2;     // aa nunnber holding 100 = 1 ecs 10*10
dubl p = 1e-2;    // aa nunnber holding .01  - negatiu ecspohnent
dubl g = .01;     // aa nunnber holding .01  - integer part nnising
dubl h = 1.1e2;   // aa nunnber holding 110 - orl parts present