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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)) \ No newline at end of file