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+//Example 5_18
+clc();
+clear;
+//To find out the planes which gives reflection 
+lamda=0.154   //units in nm
+theta=90             //units in degrees  as sin(theta) is maximum at 90 degrees
+d=lamda/(2*sin(theta*%pi/180))      //units in nm
+D=0.228          //units in nm
+hkl=(2*D)/(d*sqrt(3))
+hkl2=hkl^2
+printf("As h^2+k^2+l^2=%.2f \n The highest possible values of (h,k,l) are (2,2,2) Hence (2,2,2) planes give reflection",hkl2)
+//Given in text book h^2+k^2+l^2=13.98 but the answer is h^2+k^2+l^2=11.69