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clear
//
//
//
//Variable declaration
n=1 //order
theta=19.2*%pi/180 //glancing angle(radian)
lamda=1.54 //wavelength(angstrom)
h=1
k=1
l=1
//Calculation
d=n*lamda/(2*sin(theta)) //lattice parameter(angstrom)
a=d*sqrt(h**2+k**2+l**2) //cube edge of unit cell(angstrom)
//Result
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