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+//Example number 7.12, Page number 7.18
+
+clc;clear;close
+
+// Variable declaration
+a=3.16 // in m
+lamda=1.54 // in m
+n=1// unitless
+theta=20.3*%pi/180 // radian
+
+// Calculations
+d=(n*lamda)/(2*sin(theta)) // in m
+x=a/d                             // let sqrt(h^2+k^2+l^2)=x
+
+// Result
+printf("d = %.2f Angstrom",d)
+printf("\nsqrt(h^2+k^2+l^2) = %.3f ",x)
+printf("\nTherefore, h^2+k^2+l^2 =sqrt(2)")
+printf("\nh =1, k=1")