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+//chapter 4
+//example 4.11
+//page 125
+clear all;
+clc ;
+//given
+R4=4.7;//kohm
+hfe=70;
+deltaT=100-25;//change in temperature
+//deltaVbe/deltaT=-1.8mV/degreeC
+deltaVbe=-1.8*deltaT;
+deltaIc=-deltaVbe/R4;//microA
+printf("\nchange in Ic =%.1f microA",deltaIc);
+
+Re=R4;
+Rt=(56*68/(56+68));
+//stability factor
+S=(1+hfe)/(1+hfe*(Re/(Re+Rt)));
+printf("\nstability factor=%.1f",S);
+
+
+
+
+