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clear
//
//
//
//Variable declaration
M=28; //atomic weight of Si
N=6.023*10^23; //avagadro number
a=5.3*10^-10; //lattice constant(m)
n=4;
//Calculations
V=a^3; //volume(m^3)
m=M/(N*10^3); //mass(kg)
rho=n*m/V; //volume density(kg/m^3)
//Result
printf("\n volume density is %e kg/m^3",rho)
printf("\n answer in the book is wrong")
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