//chapter 14
//example 14.10
//page 615
printf("\n")
printf("given")
Ib=500*10^-9;Vi=1;Acl=10;
I1=100*Ib
R1=Vi/I1
R1=18*10^3;//use standard value
R2=Acl*R1
R4=R1
R3=R1/Acl