//chapter 2
//example 2.6
//page 43
printf("\n")
printf("given")
If=0;Vf=5;R1=100;
E=(If*R1)+Vf
disp("E")
disp("B)")
Vf=0;E=5;R1=100;
If=(E/R1)*1000;
printf("resistance is %dmA\n",If)