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+//Example 2.5, Page Number 70
+//The Function fpround(dependency) is used to round a floating point number x to n decimal places
+//Contact Potential Difference
+clc;
+nd=10**22 //Donor Impurity Level in per meter cube
+na=10**24 //Acceptor Impurity Level in per meter cube
+n=2.4*(10**19) //Intrinsic Electron Concentration in per meter cube
+T=290 //Temperature in Kelvin
+k=1.38*(10**-23) //Botlzmann Constant in meter square kilogram per second square Kelvin
+e=1.6*(10**-19) //Charge of an electron in coulombs
+
+//From Equation 2.45 
+v=(k*T/e)*log1p((nd*na)/(n**2)) //v is the contact potentital difference in volts
+v=fpround(v,2)
+mprintf("The Contact Potential Difference is:%.2f Volts ",v)