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+//Example 4.30
+//Cascade connection of systems
+clc
+clear
+n=0:10;
+h11=[1 -0.5];
+for i=1:length(n)
+    h2(i)=0.5^n(i);
+    if (n(i)==0) then
+        h1(i)=1;
+    elseif n(i)==1 then
+            h1(i)=-0.5
+    else
+        h1(i)=0;
+    end
+end
+h=convol(h11,h2);
+n2=0:11;
+//assume x[n]=[1 1 1]
+n1=0:2;
+x=[1 1 1];
+n3=0:13;
+y=convol(x,h);
+subplot(3,1,1);
+plot(n1,x,'.');
+xtitle("Input Signal x[n]","n","x[n]")
+subplot(3,1,2);
+plot(n2,h,'.');
+xtitle("Impulse Response h[n]","n","h[n]")
+subplot(3,1,3);
+plot(n3,y,'.');
+xtitle("Output Signal y[n]","n","y[n]")
+disp("the given system is an invertible system");