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+clear
+//
+//
+//
+
+//Variable declaration
+delta_Hf=1.6*10**-19
+T=500 //temperature(K)
+N=6.026*10**23
+k=1.38*10**-23 //boltzmann constant
+mv=5.55 //molar volume(cm**3)
+ne=10**6 //number of edge dislocations(per cm**3)
+v=5*10**7 //number of vacancies
+a=2*10**-8 //lattice parameter(cm)
+
+//Calculation
+n=(N/mv)*exp(-delta_Hf/(k*T)) //number of vacancies at 300K(per mol)
+ac=n*a/(v*ne) //amount of climb down(cm)
+
+//Result
+printf("\n amount of climb down is %0.5f *10**-8 cm",ac*10**8)