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+//Example 2.1 On Law Of Continuity
+
+// Initialisation of variables
+dA_by_dS = -0.1;
+A = 4;
+V = 90;
+
+// Calculations
+dV_by_dS = -1*V*dA_by_dS/A;
+if(dV_by_dS > 0 ) then
+ flag = "Increasing";
+else flag = "Decreasing";
+end
+
+//Results
+disp(dV_by_dS,flag, "The Velocity (ft/sec)is :");
+