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clear
//Initialisation
OG=2*10**5 //Open Loop Gain
CG=20 //Closed Loop Gain
OR1=75 //Output Resistance
IR1=2*10**6 //Input Resistance
R1=20*10**3 //Resistnce in Ohm
R2=10**3 //Resistnce in Ohm
//Calculation
AB=OG*CG**-1 //factor (1+AB)
OR2=OR1*AB**-1 //Output Resistance
//the input is connected to a virtual earth point by the resistance R2,
//so the input resistance is equal to R 2 ,
IR2=R2 //Input Resistance
//Result
printf("\n Output Resistance = %.1f mOhm\n",OR2*1000)
printf("\n Input Resistance = %d KOhm",IR2*10**-3)
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