//chapter 3
//example 3.20
//page 117
printf("\n")
printf("given")
E=5;Vo=4.5;Il=2*10^-3;Vf=0.7;
R1=(E-Vo)/Il;
printf(" suitable resistance is %dohm\n",R1)
Vr=E
disp("when diode is forward baised")
If=(E-Vf)/R1;
printf(" diode forward current is %3.3fA\n",If)