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+// Example 9_9
+clc;funcprot(0);
+// Given data
+P_1=100;// kPa
+T_1=25+273;// K
+r_p=5;// The pressure ratio
+T_3=850+273;// The maximum temperature in K
+k=1.4;// The specific heat ratio
+
+// Calculation
+T_2=T_1*(r_p)^((k-1)/k);// K
+T_4=T_3*(1/r_p)^((k-1)/k);// K
+w_r=(T_2-T_1)/(T_3-T_4);// The back work ratio
+n=1-(r_p)^((1-k)/k);// The thermal efficiency
+printf("\nThe back work ratio,w_comp/w_turb=%0.3f or %2.0f percentage. \nThe thermal efficiency,n=%0.3f(%2.1f percentage)",w_r,w_r*100,n,n*100);