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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