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+//Example number 4.6, Page number 68
+
+clc;clear;
+close;
+
+//Variable declaration
+e=1.6*10**-19;    //charge(c)
+m=9.1*10**-31;    //mass(kg)
+h=6.625*10**-34;   //plank constant
+n=1;   //order
+theta=9+(12/60)+(25/(60*60));    //angle(degree)
+V=235.2;    //kinetic energy of electron(eV)
+//Calculation
+theta=theta*%pi/180;    //angle(radian)
+lamda=h*10**10/sqrt(2*m*e*V);   
+d=n*lamda/(2*sin(theta));       //interplanar spacing(angstrom)
+//Result
+printf("interplanar spacing is %.3f Angstrom",d)
+//answer in the book is wrong