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+//Example number 6.7, Page number 6.48
+
+clc;clear;close
+
+// variable declaration
+d=2.351                 // bond length
+N=6.02*10^26           // Avagadro number
+n=8                     // number of atoms in unit cell
+A=28.09                 // Atomin mass of silicon
+m=6.02*10^26           // 1mole
+
+// Calculations
+a=(4*d)/sqrt(3) // in m
+p=(n*A)/((a*10^-10)*m)    // density
+
+// Result
+printf("a=%.2f Angstorm",(a))
+printf("\ndensity = %.2f kg/m^3",(p*10^16))
+// Answer given in the textbook is wrong"