ftp.nice.ch/pub/next/unix/audio/cmusic.bs.N.tar.gz#/tutorials/startup/misc/bess.c

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#include <stdio.h>
#include <math.h>

#define L 80

main( argc, argv ) int argc ; char *argv[] ; {
 double x ;
 int i, n ;
    n = atoi( argv[1] ) ;
    for ( i = 0 ; i < L ; i++ )
	printf( "%f\n", jn( n, (double) 16*i/L ) ) ;
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.