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+//Chapter 8, Example 8.3
+clc
+funcprot()
+//Initialisation
+p1=5                           //power gain
+p2=50                           //power gain
+p3=500                           //power gain
+v1=5                           //voltage gain
+v2=50                           //voltage gain
+v3=500                           //voltage gain
+
+
+//initialising a function for gain in dB
+function [x]=pgain(a)
+  x=10*log10(a)
+endfunction
+
+function [x]=vgain(a)
+  x=20*log10(a)
+endfunction
+
+//calling a functions
+[pd1]=pgain(p1)
+[pd2]=pgain(p2)
+[pd3]=pgain(p3)
+[vd1]=vgain(v1)
+[vd2]=vgain(v2)
+[vd3]=vgain(v3)
+
+//Result
+printf("Power Gain (dB) of 5 = %.1f dB\n",pd1)
+printf("Power Gain (dB) of 50 = %.1f dB\n",pd2)
+printf("Power Gain (dB) of 500 = %.1f dB\n",pd3)
+printf("Voltage Gain (dB) of 5 = %.1f dB\n",vd1)
+printf("Voltage Gain (dB) of 50 = %.1f dB\n",vd2)
+printf("Voltage Gain (dB) of 500 = %.1f dB\n",vd3)