RoundOff is a math code snippet to round a double to the nearest integer.


//From http://www.richelbilderbeek.nl/CppRoundOff.htm

int RoundOff(const double x)

{

  return (x > 0.0 

    ? static_cast<int>(x + 0.5) 

    : static_cast<int>(x - 0.5));

}

RoundOff test


//From http://www.richelbilderbeek.nl/CppRoundOff.htm

int RoundOff(const double x)

{

  return (x > 0.0 

    ? static_cast<int>(x + 0.5) 

    : static_cast<int>(x - 0.5));

}



#include <cassert>



int main()

{

  assert(RoundOff(-2.4)==-2);

  assert(RoundOff(-1.6)==-2);

  assert(RoundOff(-1.5)==-2);

  assert(RoundOff(-1.4)==-1);

  assert(RoundOff(-0.6)==-1);

  assert(RoundOff(-0.5)==-1);

  assert(RoundOff(-0.4)== 0);

  assert(RoundOff(-0.1)== 0);



  assert(RoundOff( 0.1)==0);

  assert(RoundOff( 0.4)==0);

  assert(RoundOff( 0.5)==1);

  assert(RoundOff( 0.6)==1);

  assert(RoundOff( 1.4)==1);

  assert(RoundOff( 1.5)==2);

  assert(RoundOff( 1.6)==2);

  assert(RoundOff( 2.4)==2);

}

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(C++) RoundOff

RoundOff test