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//Variable declaration
lamda=0.071*10**-9; //wavelength(m)
a=0.28*10**-9; //lattice constant(m)
h=1;
k=1;
l=0;
n=2; //order of diffraction
//Calculation
d=a/sqrt(h**2+k**2+l**2);
x=n*lamda/(2*d);
theta=asin(x); //angle(radian)
theta=theta*180/%pi; //glancing angle(degrees)
//Result
printf('glancing angle is %0.3f degrees \n',int(theta))
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