Cullen and Woodall numbers: Difference between revisions

=={{header|C++}}==

<syntaxhighlight lang="c++">

#include <cstdint>

#include <iostream>

#include <string>

uint32_t number, power;

void number_initialise() {

number = 0;

power = 1;

}

enum NumberType { Cullen, Woodhall };

uint32_t next_number(NumberType number_type) {

number += 1;

power <<= 1;

switch ( number_type ) {

case Cullen: return number * power + 1;

case Woodhall: return number * power - 1;

};

return 0;

}

void number_sequence(uint32_t count, NumberType number_type) {

std::string type = ( number_type == Cullen ) ? "Cullen" : "Woodhall";

std::cout << "The first " << count << " " << type << " numbers are:" << std::endl;

number_initialise();

for ( uint32_t index = 1; index <= count; ++index ) {

std::cout << next_number(number_type) << " ";

}

std::cout << std::endl << std::endl;

}

int main() {

number_sequence(20, Cullen);

number_sequence(20, Woodhall);

}

</syntaxhighight>

{{ out }}

<pre>

The first 20 Cullen numbers are:

3 9 25 65 161 385 897 2049 4609 10241 22529 49153 106497 229377 491521 1048577 2228225 4718593 9961473 20971521

The first 20 Woodhall numbers are:

1 7 23 63 159 383 895 2047 4607 10239 22527 49151 106495 229375 491519 1048575 2228223 4718591 9961471 20971519

</pre>