System.Random.InternalSample C# (CSharp) Method

      private int InternalSample() {
          int retVal;
          int locINext = inext;
          int locINextp = inextp;

          if (++locINext >=56) locINext=1;
          if (++locINextp>= 56) locINextp = 1;
          
          retVal = SeedArray[locINext]-SeedArray[locINextp];
          
          if (retVal<0) retVal+=MBIG;
          
          SeedArray[locINext]=retVal;

          inext = locINext;
          inextp = locINextp;
                    
          return retVal;
      }