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+//Example number 1.7, Page number 12
+
+clc;clear;
+close;
+
+//Variable declaration
+e=1.6*10**-19;      //charge(coulomb)
+epsilon0=8.85*10**-12;   
+r=0.5*10**-9;    //distance(m)
+I=5;    //ionisation energy(eV)
+E=4;   //electron affinity(eV)
+
+//Calculation
+C=e**2/(4*%pi*epsilon0*e*r);    //coulomb energy(eV)
+Er=I-E-C;    //energy required(eV)
+
+//Result
+printf( "energy required is %.1f eV",Er)
+