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clear
//
//
//
//Variable declaration
r=0.1278*10**-9 //atomic radius(m)
n=4 //number of atoms per unit cell
M=63.5 //atomic weight(amu)
N=6.02*10**26 //avagadro number(kg/mol)
//Calculation
a=sqrt(8)*r //lattice constant(m)
rho=n*M/(a**3*N) //density(kg/m**3)
//Result
printf("\n density is %0.2f kg/m**3",rho)
printf("\n answer given in the book is wrong")
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