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clear
//
//
//
//Variable declaration
h=2
k=2
l=0 //miller indices
a=450 //length(nm)
//Calculation
d220=a/sqrt(h**2+k**2+l**2) //interplanar spacing(nm)
//Result
printf("\n interplanar spacing is %0.1f nm",d220)
printf("\n answer given in the book is wrong")
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