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+//Example number 4.3, Page number 66
+
+clc;clear;
+close;
+
+//Variable declaration
+a=0.28*10**-9;    //lattice spacing(m)
+n=2;   //order
+lamda=0.071*10**-9;    //wavelength(m)
+h=1;
+k=1;
+l=0;
+//Calculation
+d110=a/sqrt(h**2+k**2+l**2);     //spacing(m)
+theta=asin(n*lamda/(2*d110));    //glancing angle(radian)
+theta=theta*180/%pi;          //glancing angle(degrees)
+//Result
+printf("glancing angle is %.2f degree",theta)
+//answer in the book is wrong