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+//pagenumber 228 example 45
+clear
+icb=2*10^-6;//ampere
+vbb=1;//volt
+r1=50*10^3;//ohm
+//current increases every 10celsius rb at 75celsius
+vb=-0.1;//volt
+icb=2^6*10^-6;//at 75celsius
+rb=(vb+vbb)/icb;
+disp("rb at 75 celsius   =   "+string((rb))+"ohm");
+icb=(vb+vbb)/r1;
+disp("icb   =   "+string((icb))+"ampere");
+w=(log10(icb*10^6)*20/log10(2))-25;
+disp("temperature at which current till max   =   "+string((w))+"celsius");
+