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+//Example 4.23
+//Program to Compute the DFT of given Sequence 
+//x[n]=cos(n*pi/2), and N=4 using DIF-FFT Algorithm.
+clear;
+clc ;
+close ;
+N=4;
+pi=22/7;
+n=0:1:N-1;
+x =cos(n*pi/2);
+//FFT Computation
+X = fft (x , -1);
+disp(X,'X(z) = ');
+\ No newline at end of file