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+// Chapter 5 Example 9
+//==============================================================================
+clc;
+clear;
+
+//input data
+// (100) planes in rock crystal
+h       = 1;            // miller indice
+k       = 0;            // miller indice
+l       = 0;            // miller indice
+a       = 2.814         // lattice constant in Å
+
+// Calculations
+dhkl    = a/sqrt((h^2)+(k^2)+(l^2)); // interplanar distance
+
+// Output
+mprintf('d-spacing for (100) plane in rock salt = %3.3f Å',dhkl);
+//==============================================================================
+