  The main purpose of this paper is to determine the approximations of
Durrmeyer modification of Szasz-Mirakjan operators, defined by Mishra et al.
(Boll. Unione Mat. Ital. (2016) 8(4):297-305). We estimate the order of
approximation of the operators for the functions belonging to the different
spaces. Here, the rate of convergence of the said operators is established by
means of the function with derivative of the bounded variation. At last, the
graphical analysis is discussed to support the approximation results of the
operators.
