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+//Example number 4.4, Page number 67
+
+clc;clear;
+close;
+
+//Variable declaration
+n=1;   //order
+lamda=3*10**-10;    //wavelength(m)
+h=1;
+k=0;
+l=0;
+theta=40;    //angle(degree)
+//Calculation
+theta=theta*%pi/180;    //angle(radian)
+d=n*lamda/(2*sin(theta));     //space of plane(m)
+a=d*sqrt(h**2+k**2+l**2);     
+V=a**3;      //volume of unit cell(m**3)
+//Result
+printf("space of plane is %.4f Angstrom",d*10**10)
+printf("\n volume of unit cell is %.3e m**3",V)