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+//Initialisation of variables
+clc
+n=2//number of atoms in plane
+r=3.5e-8/2//armstrom
+//interatomic distance=2*r
+a=4*r/sqrt(2)
+Area=a^2
+AtomsperArea=n/Area
+printf('atoms per cm cube is %e\n',AtomsperArea)//correction