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diff --git a/2168/CH15/EX15.4/Chapter15_example4.sce b/2168/CH15/EX15.4/Chapter15_example4.sce
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+clc

+clear

+//Input data

+//Data from problem 1

+n=6//Number of cylinders

+p=720//Horse power in h.p

+N=180//Speed in r.p.m

+f=250//Fuel rate in gm per horse power hour

+

+Vo=20//Volume of oil in the suction chamber in c.c

+dp=80//Discharge pressure in kg/cm^2

+voi=6//Volume of oil in the injector in c.c

+g=0.9//Specific gravity of oil

+b=78.8*10^-6//Coefficient of compressibility in cm^2/kg when pressure is taken as atmospheric

+

+//Calculations

+w=(((f/1000)*p)/((N/2)*60*n))*1000//Weight of fuel per cycle in gm/cycle

+Va=(w/g)//Volume of air per cycle in c.c

+V1=(Vo+Va)//Initial volume in c.c

+dV12=(b*V1*dp)//Change in volume in c.c

+//Assuming in accordance with average practice that s=2d, nv=0.94 and full load in this pump type x=0.5

+d=((voi+dV12)/((3.14/4)*2*0.94*0.5))^(1/3)//Diameter in cm

+l=(2*d)//Stroke in cm

+

+//Output

+printf('The diameter of the pump is %3.2f cm \n The total stroke is %3.2f cm',d,l)