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#include <stdio.h>
#include "real.h"
#include "real-impl.h"
main(int argc, char *argv[])
{
Real x, y;
double f;
Real makeRealSignCNQInt(Sign, char *, int, int, int);
Real iterate(Real, int);
int niters;
MyName = argv[0];
if (argc != 8) {
fprintf(stderr, "%s <sign> <c> <n> <a> <b> <n-iters> <ndigits>\n",
MyName);
exit(1);
}
initReals();
y = makeRealSignCNQInt(
atoi(argv[1]), /* sign */
argv[2], /* c */
atoi(argv[3]), /* n */
atoi(argv[4]), /* a */
atoi(argv[5])); /* b */
niters = atoi(argv[6]);
print_R_Dec(y, atoi(argv[7]));
printf("\n");
x = iterate(y, niters);
print_R_Dec(x, atoi(argv[7]));
printf("\n");
}
/*
* Iterates the function f(x) = 4x(1-x)
*/
Real
iterate(Real x, int n)
{
Real p, q, r;
if (n > 0) {
r = iterate(x, n - 1);
p = mul_R_Int(r, 4);
q = sub_Int_R(1, r);
r = mul_R_R(p, q);
if (n > 15)
r = makeStream(r);
return r;
}
else
return x;
}
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