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+//Example number 2.5, Page number 33
+clc;clear;
+close;
+
+// Variable declaration
+N=6.02*10**26;           // Avagadro Number
+M=63.5;    // atomic weight(amu)
+r=0.1278*10**-9;    // atomic radius(m)
+n=4;
+
+// Calculation
+a=r*sqrt(8);    // lattice constant(m)
+rho=n*M/(N*a**3);      // density(kg/m**3)
+
+// Result
+printf( "density is %.2f kg/m**3",rho)
+//answer in the book is wrong