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diff --git a/45/CH15/EX15.4/example_15_4.sce b/45/CH15/EX15.4/example_15_4.sce
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+++ b/45/CH15/EX15.4/example_15_4.sce
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+//example 15.4
+clc;
+clear;
+//f=input('Enter the input square wave signal frequency in kHz:');
+//t=input('Enter the gate enble time in seconds ' );
+//first part :
+f=7.50;
+t=0.1;
+format('v',18);
+m=t*f*1000; //making neccesary calculations 
+printf('For t = %f seconds\n',t);  // displaying results 
+printf('The counter will count up to : %f\n',m);
+//part2
+t=1;
+printf('\n\nFor t = %f seconds\n',t);
+m=t*f*1000;
+printf('The counter will count up to : %f\n',m);
+//part3
+t=10;
+m=t*f*1000;
+printf('\n\nFor t = %f seconds\n',t); 
+printf('The counter will count up to : %f\n',m);