//chapter 18
//example 18.10
//page 785
printf("\n")
printf("given")
I1=1*10^-3;Vref=1.25;Vo=6;Vs=15;Il=200*10^-3;
R1=Vref/I1
R2=(Vo-Vref)/I1
Pd=(Vs-Vo)*Il;
printf("regulated power dissipation is %3.2fW\n",Pd)