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+// chapter14
+// example14.14
+// page 308
+
+Vcc=15 // V
+R1=22 // kilo ohm
+R2=3.3 // kilo ohm
+R3=5 // kilo ohm
+R4=1 // kilo ohm
+R5=15 // kilo ohm
+R6=2.5 // kilo ohm
+R8=1 // kilo ohm
+R3=5 // kilo ohm
+R7=5 // kilo ohm
+Rl=10 // kilo ohm
+gain_beta=200
+Vbe=0.7 // V
+
+// for second stage
+V_R6=Vcc*R6/(R6+R5)
+V_R8=V_R6-Vbe
+I_E2=V_R8/R8 // emitter current in R8
+re_dash2=25d-3/I_E2
+Zin_base=gain_beta*re_dash2
+Zin=R5*(R6*Zin_base/(R6+Zin_base))/(R5+(R6*Zin_base/(R6+Zin_base)))
+R_AC2=R7*Rl/(R7+Rl)
+Av2=R_AC2/re_dash2
+
+// for first stage
+V_R2=Vcc*R2/(R2+R1)
+V_R4=V_R2-Vbe
+I_E1=V_R4/R4 // emitter current in R4
+re_dash1=25d-3/I_E1
+R_AC1=R3*Zin/(R3+Zin)
+Av1=R_AC1/re_dash1
+
+Av=Av1*Av2
+
+printf("voltage gain of first stage = %.3f \n",Av1)
+printf("voltage gain of second stage = %.3f \n",Av2)
+printf("overall voltage gain= %.3f \n",Av)
+
+// the accurate answers are voltage gain of first stage = 52.616, voltage gain of second stage = 192.381, overall voltage gain= 10122.329. In book the answers are 53,191.4 and 10144 
+// respectively