//example-2.11
//page no-59
//given
//dipole moment og HF is
DM=6.375*10^(-30)  //Cm
//intermolecular distance
r=0.9178*10^(-10)  //m
//charge on an electron
e=1.67*10^(-19)  //C
//since the HF posses ionic characters
//so
//Hf in fully ionic state has dipole moment as
DM2=r*e  //Cm
//percentage ionic characters
percentage=DM/DM2*100  //%
printf ("the percentage ionic character is %f approx.",percentage)