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+//Example number 5.12, Page number 89
+
+clc;clear;
+close;
+
+//Variable declaration
+m=1.675*10**-27;    //mass(kg)
+h=6.626*10**-34;   //plank constant
+E=0.04;     //kinetic energy(eV)
+e=1.6*10**-19;    //charge(c)
+n=1;
+d110=0.314*10**-9;   //spacing(m)
+//Calculation
+E=E*e;       //energy(J)
+lamda=h/sqrt(2*m*E);
+theta=asin(n*lamda/(2*d110));     //glancing angle(radian)
+theta=theta*180/%pi;        //glancing angle(degrees)
+theta_m=60*(theta-int(theta));
+//Result
+printf("glancing angle is %d degree and %d minutes",theta,theta_m)
+//answer given in the book is wrong