110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
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/*
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* PCG Random Number Generation for C.
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*
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* Copyright 2014 Melissa O'Neill <oneill@pcg-random.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* For additional information about the PCG random number generation scheme,
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* including its license and other licensing options, visit
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*
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* http://www.pcg-random.org
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*/
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/*
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* This is the original demo application from the PCG library ported to the new API
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <time.h>
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#include <string.h>
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#include "pcg32.h"
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int main(int argc, char** argv) {
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// Read command-line options
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int rounds = 5;
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if (argc > 1)
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rounds = atoi(argv[1]);
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pcg32 rng;
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// You should *always* seed the RNG. The usual time to do it is the
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// point in time when you create RNG (typically at the beginning of the
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// program).
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//
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// pcg32::seed takes two 64-bit constants (the initial state, and the
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// rng sequence selector; rngs with different sequence selectors will
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// *never* have random sequences that coincide, at all)
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rng.seed(42u, 54u);
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printf("pcg32_random_r:\n"
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" - result: 32-bit unsigned int (uint32_t)\n"
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" - period: 2^64 (* 2^63 streams)\n"
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" - state type: pcg32_random_t (%zu bytes)\n"
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" - output func: XSH-RR\n"
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"\n",
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sizeof(pcg32));
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for (int round = 1; round <= rounds; ++round) {
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printf("Round %d:\n", round);
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/* Make some 32-bit numbers */
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printf(" 32bit:");
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for (int i = 0; i < 6; ++i)
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printf(" 0x%08x", rng.nextUInt());
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printf("\n");
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/* Toss some coins */
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printf(" Coins: ");
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for (int i = 0; i < 65; ++i)
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printf("%c", rng.nextUInt(2) ? 'H' : 'T');
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printf("\n");
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/* Roll some dice */
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printf(" Rolls:");
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for (int i = 0; i < 33; ++i) {
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printf(" %d", (int)rng.nextUInt(6) + 1);
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}
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printf("\n");
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/* Deal some cards */
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enum { SUITS = 4, NUMBERS = 13, CARDS = 52 };
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char cards[CARDS];
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for (int i = 0; i < CARDS; ++i)
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cards[i] = i;
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rng.shuffle(cards, cards + CARDS);
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printf(" Cards:");
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static const char number[] = {'A', '2', '3', '4', '5', '6', '7',
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'8', '9', 'T', 'J', 'Q', 'K'};
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static const char suit[] = {'h', 'c', 'd', 's'};
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for (int i = 0; i < CARDS; ++i) {
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printf(" %c%c", number[cards[i] / SUITS], suit[cards[i] % SUITS]);
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if ((i + 1) % 22 == 0)
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printf("\n\t");
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}
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printf("\n");
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printf("\n");
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}
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return 0;
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}
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