In 1987, Cahit [4] introduced cordial labeling as a weaker version of graceful labeling and harmonious labeling. In 2011, Varatharajan et al. [8] have introduced divisor cordial labeling as a variant of cordial labeling. In this paper, we investigate divisor cordial labeling for comb graph, square graph of path, square graph of cycle, middle graph of path and middle graph of cycle.

graph labeling, cordial labeling, divisor cordial labeling, graph operation.