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clear
//
//
//
//Variable declaration
lamda=1.54*10**-10 //wavelength(m)
n=1 //order
theta=19.2*%pi/180 //glancing angle(radian)
h=1
k=1
l=1
//Calculation
d=n*lamda/(2*sin(theta))
a=d*sqrt(h**2+k**2+l**2) //cube edge of unit cell(m)
//Result
printf("\n cube edge of unit cell is %0.3f *10**-10 m",a*10**10)
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