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+//chapter 2
+//example 2.2
+//calculate distance between two nearest Cu atoms
+//page 41
+clear;
+clc;
+//given
+N=6.02E23; // in /gram-atom (Avogadro's number)
+n=4; // number of atom per unit cell for fcc structure
+M=63.5; //in gram/gram-atom (atomic weight of Cu)
+p=8.96; // in g/cm^3 (density)
+//calculate
+a=nthroot((n*M/(N*p)),3);
+printf('\nThe lattice constant is\ta=%1.2E cm',a); 
+a=a*1E8; // changing unit from cm to Angstrom
+printf('\n\t\t\ta=%.2f Angstrom',a); 
+d=a/sqrt(2); // distance infcc lattice
+printf('\nThe distance between two nearest Cu atoms is \td=%.2f Angstrom',d);