clc
//given that
d = 2.5 // crystal spacing in angstrom
n = 1 // order for longest passing wavelength
theta = 90 // angle for longest passing wavelength
printf("Example 3.6")
lambda = 2*d*sin(theta*%pi/180)/n // Calculation of longest wavelength

printf("\nLongest wavelength is  of %d angstrom. \n\n\n",lambda)