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+//Caption:determine_unit_step_and_unit_impulse_response
+//example 12.11
+//page 524
+s=%s;
+syms t;
+G=sym('8/(s+1)');
+H=sym('(1/2*s)');
+CL=G/(1+G*H);
+disp(CL,"C(s)/R(s)=");
+//for unit step response R(s)=1/s; 
+d=CL*(1/s);
+disp(d,"C(s)=");
+c=ilaplace(d,s,t);
+disp(c,"unit step response,c(t)=");
+//for unit impulse response R(s)=1; 
+e=CL*(1);
+disp(e,"C(s)=");
+ct=ilaplace(e,s,t);
+disp(ct,"unit impulse response,c(t)=");