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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);