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+//chapter 13
+//example 13.1
+//page 396
+clear all;
+clc ;
+//given
+Rc=10;//collector resistors
+Re=3.9;//emitter resistor
+Vcc=12;Vee=-12;//dual supply
+Vbe=0.7;
+Vb4=-3.5;//Q4 base voltage with respect to ground
+VB4=Vb4-(Vee);//voltage at base of transistor 4
+Ie=(VB4-Vbe)/Re;//emitter current
+printf("\nemitter current through Q4= %d mA",Ie);
+Ie2=Ie/2;
+Ie1=Ie2;
+Ic1=Ie1;
+Ic2=Ie2;
+printf("\nemitter currents through Q1&Q2= %d mA",Ie1);
+printf("\ncollector currents through Q1&Q2= %d mA",Ic1);
+Vc2=Vcc-Ic1*Rc;
+Vc1=Vc2;
+printf("\nvoltage across collectors of transistors Q1&Q2 = %d V",Vc1)