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diff --git a/3838/CH6/EX6.4.c/EX6_4_C.sce b/3838/CH6/EX6.4.c/EX6_4_C.sce
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+//example 6.4.C
+//check the signal is periodic or not
+clc ;
+n=-15:0.01:15;
+y =(1+cos(2*(%pi)*n/8)/2);
+xlabel('n')
+ylabel('x(n)')
+plot(n,y);
+disp ( 'Plot  shows that given signal is periodic of fundamental period=4 samples' ) ;