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+//Example No.6.9.

+//Page No.189.

+clc;clear;

+d = 0.2338;//'d' is the interplanar distance -[nm].

+// (h,k,l) are the miller indices of the given plane.

+h = (-1);

+k = 1;

+l = 1;

+a = (d*sqrt(h^2+k^2+l^2));//'a' is the lattice constant

+printf("\nThe lattice constant is %.4f nm",a);