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//Example number 4.9, Page number 69
clc;clear;
close;
//Variable declaration
n=1; //order
h=2;
k=0;
l=2;
theta=34; //angle(degree)
lamda=1.5; //wavelength(angstrom)
//Calculation
theta=theta*%pi/180; //angle(radian)
d=n*lamda/(2*sin(theta)); //spacing of crystal(angstrom)
a=d*sqrt(h**2+k**2+l**2); //lattice parameter(angstrom)
//Result
printf("lattice parameter is %.3f Anstrom",a)
//answer in the book is wrong
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