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+//Example 3.18//
+rsi=0.117;//nm //atomic radius of silicon (From appendix 2)
+a=8;//given // (a is obtain by cross multiplication)
+l= a*rsi//nm //body diagonal length
+mprintf("l = %f nm",l)
+//the linear density
+b=2;//atoms //From the figure 3.23 there are two atoms per lattice point therefore we choose value 2 atoms in linear density
+ld=b/l
+mprintf("\n ld = %f atoms/nm",ld)