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//Variable declaration
n=2; //number of atoms
M=55.85; //atomic weight(kg)
rho=7860; //density(kg/m**3)
Na=6.02*10**26; //avagadro number
//Calculation
a3=n*M/(rho*Na);
a=a3**(1/3); //lattice constant(m)
//Result
printf('lattice constant is %0.3f angstrom \n',(a*10**10))
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