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clear
//
//
//
//Variable declaration
e=1.6*10^-19; //charge(coulomb)
x=9*10^9;
r0=3.56*10^-10; //equilibrium distance(m)
A=1.763; //madelung constant
n=10.5; //repulsive exponent value
IE=3.89; //ionisation energy(eV)
EA=-3.61; //electron affinity(eV)
//Calculations
U0=-(x*A*e/r0)*(1-1/n); //ionic cohesive energy(eV)
U=U0+IE+EA; //atomic cohesive energy(eV)
//Result
printf("\n ionic cohesive energy is %0.2f eV",U0)
printf("\n atomic cohesive energy is %0.2f eV",U)
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