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+//chapter 1
+//example 1.7
+//calculate contribution per ions to the cohesive energy
+//page 17
+clear;
+clc;
+//given
+r_0=2.81; // in Angstrom
+e=1.6E-19; // in C (charge of electron)
+n=9; // Born constant
+E_o= 8.85E-12;// absolute premittivity
+alpha=1.748; // Madelung constant
+pi=3.14; // value of pi used in the solution
+//calculate
+r_0=r_0*1E-10; // since r is in nanometer
+V=-alpha*(e^2/(4*pi*E_o*r_0))*(1-1/n); // calculate potential energy
+V=V/e; //changing unit from J to eV
+printf('\nThe potential energy is\tV=%.2f eV',V); 
+V_1=V/2; // Since only half of the energy contribute per ion to the cohecive energy therfore
+printf('\nThe energy contributing per ions to the cohesive energy is \t%.2f eV',V_1);
+ // Note: Answer in the book is wroong due to calculation mistake