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+//Example number 2.3, Page number 32
+clc;clear;
+close;
+
+// Variable declaration
+N=6.02*10**26; // Avagadro Number
+n=2;
+rho=530; // density(kg/m**3)
+M=6.94; // atomic weight(amu)
+
+// Calculation
+a=(n*M/(rho*N))**(1/3)*10**10; // lattice constant(angstrom)
+
+// Result
+printf( "lattice constant is %.3f Angstrom",a)