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+// Chapter 5 Example 12
+//==============================================================================
+clc;
+clear;
+
+// input data
+// BCC structured crystal
+
+p       = 7860;             // Density of iron in kg/m^3
+N       = 6.023*10^26;      // Avagadros number in atoms/kilomole
+A       = 55.85;            // Atomic weight
+n       = 2;                // No. of atoms per unit cell for BCC
+
+//Calculations
+
+a       = ((n*A)/(N*p))^(1/3); //lattice constant
+
+//Output
+
+mprintf('Lattice Constant of Fe = %3.3f Å \n',a*10^10);
+mprintf(' Note: density of iron is taken as 7.86 instead of 7860 in calculation')
+//==============================================================================