initial commit / add all books

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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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+//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);