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+// Chapter 5 Example 7
+//==============================================================================
+clc;
+clear;
+
+// input data
+// metallic iron changes from  BCC to FCC form at 910 degress
+rb      = 0.1258*10^-9;     // atomic radius of BCC iron atom
+rf      = 0.1292*10^-9;     // atomic radius of FCC iron atom
+
+// Calculations
+
+ab      = (4*rb)/(sqrt(3));  // lattice constant for BCC
+Vbcc    = (ab^3)/2;          // volume occupied by one BCC atom
+af      = (4*rf)/(sqrt(2))   // lattice constant for FCC
+Vfcc    = (af^3)/4;          // volume occupied by one FCC atom
+dv      = ((Vbcc-Vfcc)/Vbcc)*100        // percentage change in volume
+
+// output
+mprintf('During the structural change the percentage change in volume = %3.4f',dv);
+//==============================================================================