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+// Chapter 5 additional Example 3
+//==============================================================================
+clc;
+clear;
+
+// input data
+// NaCl has FCC structure
+
+ANa     = 23;               // atomic wt of sodiim
+ACl     = 35.45             // atomic wt of chlorine
+N       = 6.023*10^26;      // Avagadros number in atoms/kilomole
+n       = 4                 // No. of atoms per unit cell for FCC
+p       = 2180;             // density in kg/m^-3
+
+// Calculations
+
+// p    = (n*A)/(N*a^3);    density
+A       = ANa+ACl;              // atomic wt of NaCl
+a       = ((n*A)/(N*p))^(1/3);  // lattice constant
+r       = a/2                   // Distance b/w two adjacent atoms
+//Output
+mprintf('Distance between two adjacent atoms is r = %3.2e m',r);
+//==============================================================================