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+clear
+//
+//
+//
+
+//Variable declaration
+a=0.28 //lattice spacing(nm)
+lamda=0.071 //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)
+
+//Result
+printf("\n glancing angle is %0.0f degrees",theta)