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+//Example number 2.1, Page number 31
+
+clc;clear;
+close;
+
+// Variable declaration
+N=6.02*10**26;           // Avagadro Number
+n=8;    // number of atoms
+a=5.6*10**-10;    // lattice constant(m)
+M=72.59;     // atomic weight(amu)
+
+// Calculation
+rho=n*M/(a**3*N);     // density(kg/m**3)
+
+// Result
+printf( "density is %.3f kg/m^3",rho)