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+//example 15
+clear
+vcc=26;//volt
+colres=20*10^3;//ohm
+re=470;//ohm
+beta1=45;
+vce=8;//volt
+ib=(vcc-vce)/((1+beta1)*(colres+re));
+ic=beta1*ib;
+r1=((vcc-colres*(ib+ic)-re*(ib+ic)-(0.7)))/ib;
+disp("resistance   =   "+string((r1))+"ohm");
+stability=(1+beta1)/(1+(beta1*re)/(re+colres));
+disp("stability   =   "+string((stability)));//correction in the book
+
+