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+//Example 5_13
+clc();
+clear;
+//To determine the lattice parameter of the material
+lamda=0.07107 //units in nm
+theta=29.71 //units in degrees
+d400=lamda/(2*sin(theta*(%pi/180))) //units in nm
+hkl=16
+a=d400*sqrt(hkl) //units in nm
+printf("Lattice parameter of the material a=%.4fnm",a)