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+// chapter 12
+// example 12.1
+// page 235
+
+V_CC=6 // V
+R_C=2.5 // kilo ohm
+
+// for faithful amplification V_CE should not be less than V_CC for Si transistor so
+V_max=V_CC-1
+I_max=V_max/R_C
+
+// As negative and positive half cyces of input are equal, change in collector current will be equal and opposite so
+I_min=I_max/2
+
+printf("Maximum allowable collector current = %.3f mA \n",I_max)
+printf("Minimum zero signal collector current = %.3f mA \n",I_min)
+
+// the circuit diagram is constructed on xcos and its screenshot has been taken.
+// the waveform given can not be obtained in xcos unless we assume necessary values as data is insufficient for plotting graph in scilab.
+// so waveform is constructed as below
+
+clf()
+x=linspace(1,5*%pi,100)
+[t]=sin(x)+1
+plot(x,[t])
+xtitle("max and min allowable collector currents","t","i_c (mA)")