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+//EXAMPLE 2.20,Passive or lossless system.
+clear;
+clc;
+a=input("any value of a less than or equal to one")
+n=-10:1:10;
+ x=n;
+ y=a*n;
+ S=0;
+ for i=1:length(n)
+     S=S+y^2; 
+ end
+
+ if a<1 then
+     disp('the system is passive')
+ else
+     
+     a==1
+     disp('the system is lossless')
+    
+ end