(C++) RoundOff

 

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

 

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//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

 

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//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); }