clear//

//Variables

I = 1               //Current (in Ampere)

//Calculation

//Applying Kirchoff's voltage law:
//(1 *3) + (1 * R) + (1 * 4) - 12 =0

R = 5               //Resistance (in ohm)

//Result

printf("\n Value of R is  %0.3f  ohm.",R)