initial commit / add all books

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diff --git a/45/CH8/EX8.4/example_8_4.sce b/45/CH8/EX8.4/example_8_4.sce
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+//example 8.4

+clc;

+clear;

+en=input("Enter the enable input level(1 or 0) : ") ;

+r=input("enter the R input level(1 or 0) : " );//accepting the inputs from the user 

+s=input("enter the S input level(1 or 0) : " );

+qn=input("Enter the previous output value(1 or 0) : ");

+

+if en == 0 then // clculating the output 

+    op = qn;

+elseif (s==0 & r==0) then 

+    op=qn;

+elseif(s==1&r==1) then

+    disp('The inputs are illegal');

+    return;

+else

+    op=s;

+    

+end

+

+printf('\n \noutput (Qn+1) = %d ',op);//displaying the output 
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