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clear
//
//
//
//Variable declaration
e=1.6*10^-19; //charge(coulomb)
x=9*10^9;
r0=2.81*10^-10; //equilibrium distance(m)
A=1.748; //madelung constant
n=9; //repulsive exponent value
//Calculations
U0=-(x*A*e/r0)*(1-1/n); //potential energy(eV)
//Result
printf("\n potential energy is %0.3f eV",U0/2)
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