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+//Example number 3.12, Page number 50
+clc;clear;
+close;
+
+//Variable declaration
+C=0.494*10**-9;      //height(m)
+a=0.27*10**-9;      //distance(m)
+M=65.37;      //atomic weight
+N=6.02*10**26;    //avagadro number
+//Calculation
+V=3*sqrt(3)*a**2*C/2;      //volume of cell(m**3)
+m=6*M/N;
+rho=m/V;      //density of Zn(kg/m**3)
+//Result
+printf("volume of cell is %.3e m**3",V)
+printf("\n density of Zn is %.1f kg/m**3",rho)
+//answer in the book is wrong