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clear
//
//
//
//Variable declaration
theta=9.5*%pi/180 //glancing angle(radian)
lamda=0.58 //wavelength of X-rays(angstrom)
n=1 //order
h=2
k=0
l=0
//Calculation
d=n*lamda/(2*sin(theta))
a=d*sqrt(h**2+k**2+l**2) //lattice parameter(angstrom)
//Result
printf("\n lattice parameter is %0.3f angstrom",a)
printf("\n answer given in the book varies due to rounding off errors")
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