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In nacl molecule, the interaction potential between na ion and cl ion fits the following equation:

V(r)=-e²/r+ .e^-r/q

^{in this equation, the first term hammer is the coulomb potential,the second term results from the distribution of other electrons in the system.}

^{The equilibrium position between the two ions is where the potential is minimum:}

f(r)=-dV/dr=e²/r²- /q . e^-r/q =0 the root of this equation gives the r₀ bond length.experimental for NaCl =1.09*10³ eV,q=0.33 A and e² =14.4 A eV

Write the c ++ program that calculates the bond length in A using the constant (using NEWTON-RAPHSON-METHOD)