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+// Example 3.19 
+// Computation of total energy
+// Page no 485
+
+clc;
+clear;
+close;
+
+//Given data
+h=6.63*10^-34;        // Planck constant
+v=5*10^14;            // Bandgap frequency of laser
+N=10^24;              // Population inversion density
+V=10^-5;              // Volume of laser medium
+
+// Total energy
+E=(1/2)*h*v*(N)*V;           
+
+//Display result on command window
+printf("\n Total energy (J)= %0.1f  ",E);
+