Fossil

    /* Argument values */
    int iLeft;
    int iRight;
    double fLeft;
    double fRight;

    /* Left and right arguments as strings */
    char *zLeft = 0; int nLeft;
    char *zRight = 0; int nRight;
    char *zLeft = 0; int nLeft = 0;
    char *zRight = 0; int nRight = 0;

    /* Evaluate left and right arguments, if they exist. */
    if( pExpr->pLeft ){
      rc = exprEval(interp, pExpr->pLeft);
      if( rc==TH_OK ){
        zLeft = Th_TakeResult(interp, &nLeft);
      }