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//Variable declaration
lamda=0.065; //wavelength(nm)
a=0.26; //edge length(nm)
h=1;
k=1;
l=0;
n=2;
//Calculation
d=a/sqrt(h**2+k**2+l**2);
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 varies due to approximating off errors')
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