%0 Journal Article %T Length of the Longest Path and Diameter in Orientations of Graphs %A Bing Zhou %J Open Journal of Discrete Mathematics %P 65-70 %@ 2161-7643 %D 2017 %I Scientific Research Publishing %R 10.4236/ojdm.2017.72007 %X We say that a parameter p of directed graphs has the interval property if for every graph G and orientations of G, p can take every value between its minimum and maximum values. Let λ be the length of the longest directed path. A question asked by C. Lin in [1] is equivalent to the question of whether λ has the interval property. In this note, we answer this question in the affirmative. We also show that the diameter of directed graphs does not have the interval property. %K Directed Graphs %K Graph Orientation %K Interval Property %K Longest Path %K Path Length %K Diameter %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=75482