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+//chapter15
+//example15.12
+//page334
+
+T_Jmax=200 // degree celcius
+T_amb1=25 // degree celcius
+T_amb2=75 // degree celcius
+theta=20 // degree celcius per watt
+Vcc=4 // V
+
+P_total1=(T_Jmax-T_amb1)/theta
+Ic1=P_total1/Vcc
+
+P_total2=(T_Jmax-T_amb2)/theta
+Ic2=P_total2/Vcc
+
+printf("for ambient = 25 degree C, allowed collector current = %.3f A \n",Ic1)
+printf("for ambient = 75 degree C, allowed collector current = %.3f A \n",Ic2)