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clear
//
//
//
//Variable declaration
a=0.26 //lattice spacing(nm)
lamda=0.065 //wavelength of X-rays(nm)
h=1
k=1
l=0
n=2
//Calculation
d=a/sqrt(h**2+k**2+l**2)
sintheta=n*lamda/(2*d)
theta=asin(sintheta)*180/%pi //glancing angle(degrees)
thetad=int(theta) //glancing angle(degrees)
thetam=(theta-thetad)*60 //glancing angle(minutes)
thetas=60*(thetam-int(thetam)) //glancing angle(seconds)
//Result
printf("\n glancing angle is %0.3f degrees %0.3f minutes %0.3f seconds",thetad,thetam,thetas)
printf("\n answer in the book is wrong")
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