std::modf splits a double into its integer and a fractional part, for example it splits 12.34 into 12 and 0.34.

Download the Qt Creator project 'Modf' (zip)


#include <cmath>

#include <iostream>



int main()

{

  double int_part = 0.0;

  const double fraction_part = std::modf(M_E,&int_part);

  std::cout << M_E << " = "

    << int_part << " + " << fraction_part << '\n';

}

Screen output:


2.71828 = 2 + 0.718282

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(C++) std::modf