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+//Example number 3.13, Page number 51
+
+clc;clear;
+close;
+
+//Variable declaration
+T1=773; //temperature(K)
+T2=1273; //temperature(K)
+n=1*10**-10; //fraction of vacancy sites
+//Calculation
+logx=T1*log(n)/T2
+x=%e**(logx); //fraction of vacancy sites
+//Result
+printf("fraction of vacancy sites is %.3e",x)
+//answer in the book varies due to rounding off errors