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clear
//
//
//
//Variable declaration
n=1 //order of diffraction
lamda=1.54*10**-10 //wavelength(m)
theta=32 //angle(degrees)
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 lead(m)
//Result
printf("\n lattice parameter of lead is %0.1f *10**-10 m",a*10**10)
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