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+//Example number 2.4, Page number 32
+
+clc;clear;
+close;
+
+// Variable declaration
+N=6.02*10**26;           // Avagadro Number
+rho=7870;    // density(kg/m**3)
+M=55.85;    // atomic weight(amu)
+a=2.9*10**-10;    // lattice constant(m)
+
+// Calculation
+n=a**3*rho*N/M;      // number of atoms
+
+// Result
+printf( "number of atoms is %d",n)