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//Variable declaration
e=1.6*10**-19; //charge of electron(c)
epsilon0=8.85*10**-12; //permittivity(C/Nm)
r0=0.281*10**-9; //seperation(m)
IE=5.14; //ionisation energy of Na(eV)
Ea=-3.61; //electron affinity(eV)
//Calculation
V=-e**2/(4*e*%pi*epsilon0*r0);
CE=IE+Ea+(V); //cohesive energy(eV)
//Result
printf('cohesive energy is %0.3f eV \n',CE)
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