private static void printRuleMath(int n, Rule r) { string formula; if (r.isSetMath()) { formula = libsbml.formulaToString(r.getMath()); if (r.getVariable().Length > 0) { Console.Write("Rule " + n + ", formula: " + r.getVariable() + " = " + formula + Environment.NewLine); } else { Console.Write("Rule " + n + ", formula: " + formula + " = 0" + Environment.NewLine); } } }