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clc//
//
//
//Variable declaration
r1=1.258; //atomic radius(angstrom)
r2=1.292; //atomic radius(angstrom)
//Calculation
a1=4*r1/sqrt(3); //spacing(angstrom)
n1=((1/8)*8)+1; //number of atoms per unit cell
v1=a1^3/n1; //volume occupied by 1 atom(m^3)
n2=(1/2*6)+(1/8*8); //number of atoms per unit cell
a2=2*sqrt(2)*r2; //spacing(angstrom)
v2=a2^3/n2; //volume occupied by 1 atom(m^3)
dc=(v1-v2)*100/v1; //change in volume(%)
//Result
printf("\n decrease of volume is %0.1f percentage" ,dc)
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