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//Variable declaration
lamda=0.79; //wavelength(angstrom)
n=3; //order of diffraction
d=3.04; //spacing(angstrom)
//Calculation
x=(n*lamda/(2*d));
theta=asin(x); //glancing angle(radian)
theta=theta*180/%pi; //glancing angle(degrees)
theta_d=int(theta);
theta_m=(theta-theta_d)*60;
theta_s=(theta_m-int(theta_m))*60;
//Result
printf('glancing angle is %2d degrees %2d minutes %2d seconds',theta_d,int(theta_m),int(theta_s))
printf('answer given in the book is wrong\n')
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