//Chapter 1, Example 1.5

clc
//Initialisation
r1=10                                    //resistance in ohm
r2=20                                    //resistance in ohm
r3=15                                    //resistance in ohm
r4=25                                    //resistance in ohm




//Calculation
r=r1+r2+r3+r4                                    //resistance in ohm


//Results
printf("Equivalent Resistance, R = %d Ohm",r)