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//Variable declaration
n=1; //order of diffraction
theta=38.2; //angle(degrees)
lamda=1.54; //wavelength(angstrom)
h=2;
k=2;
l=0;
//Calculation
theta=theta*%pi/180; //angle(radian)
d=n*lamda/(2*sin(theta));
a=d*sqrt(h**2+k**2+l**2); //lattice parameter of nickel(angstrom)
//Result
printf('lattice parameter of nickel is %0.3f angstrom \n',(a))
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