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Programming-Idioms

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Idiom #204 Return fraction and exponent of a real number

Given a real number a, print the fractional part and the exponent of the internal representation of that number. For 3.14, this should print (approximately)

0.785 2

uses math;
var
  d: double;
  Mantissa: double;
  Exponent: integer;
begin
  d := 3.14;
  frexp(d, Mantissa, Exponent);
  writeln('Mantissa: ',Mantissa:6:5,', Exponent: ',Exponent);
end.

Prints: Mantissa: 0.78500, Exponent: 2
#include <math.h>
#include <stdio.h>
  double d = 3.14;
  double res;
  int e;

  res = frexp(d, &e);
  printf("%f %d\n",res,e);

New implementation...
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tkoenig