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+//Example9.4   // to determine the output frequency capacitor charging time of VCO
+clc;
+clear;
+close;
+Vcc = 12 ;
+Vcs = 6
+R = 10 ; // K ohm
+C = 1 ; // uF
+
+// the current through the control resistor R
+i =(Vcc-Vcs)/R ;
+disp('The current through the control resistor R is = '+string(i)+ ' mA ');
+
+// The charging time of capacitor 
+t = (0.25*Vcc*C)/i ;
+disp('The charging time of capacitor is = '+string(t)+ ' msec ');
+
+// In VCO the capacitor charging and discharging time period are equal ,so the total time period of tringular and square wave forms can be written as 2*t ;
+t = ((0.5*Vcc*C)/i);
+disp('The total time period of tringular and square wave is = '+string(t)+ ' msec ');
+
+// the output frequency of VCO is
+fo = 1/t ;
+disp('The output frequency of VCO is = '+string(fo)+ ' KHz ');