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clear
//
//
//
//Variable declaration
theta=30*%pi/180 //glancing angle(radian)
h=1
k=1
l=1
lamda=1.5418 //wavelength(angstrom)
n=1 //order
//Calculation
d=n*lamda/(2*sin(theta)) //interplanar spacing(angstrom)
a=d*sqrt((h**2)+(k**2)+(l**2)) //interatomic spacing(angstrom)
//Result
printf("\n interatomic spacing is %0.2f angstrom",a)
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