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diff --git a/1571/CH9/EX9.12/Chapter9_Example12.sce b/1571/CH9/EX9.12/Chapter9_Example12.sce
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+clc
+clear
+
+//INPUT
+t1=340;//temperature of the atmosphere in K
+t2=612;//temperature of the compression stroke in K
+y=1.39;//adiabatic expansion 
+t3=2040;//temperature after constant volume ignition in K
+
+//CALCULATIONS
+d=(t2/t1)^(1/(y-1));//density in gm/cc
+n=1-(1/d)^(y-1);//efficiency of the engine
+p=((d)^(y))*(t3/t2);//maximum temperature of the temperature in atm
+
+//OUTPUT
+mprintf('the maximum pressure of the engine is %3.2f atm',p)