tlang-interperter-cs/tlanglib/PostfixDecrementVariableNode.cs

namespace tlang
{
    public class PostfixDecrementVariableNode : Node
    {
        public GetVariableValue Node {get;set;}

        public PostfixDecrementVariableNode(GetVariableValue ret)
        {
            Node = ret;
        }

        public override TObject Execute(IScopeEnvironment nodeEnv)
        {
            
            var obj=Node.Execute(nodeEnv);
            
            var newVal=new SubtractNode(new ConstNode(obj),new ConstNode(TObject.Number(1))).Execute(nodeEnv);

            Node.SetValue(nodeEnv,newVal);
            
            

            return obj;
        }
    }
}