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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4.  
  5. int randto(int n) {
  6.     int r, maxr = (RAND_MAX / n) * n;
  7.     do r = rand(); while (r >= maxr);
  8.     return r % n;
  9. }
  10.  
  11. int main(void) {
  12.     srand((unsigned)time(0));
  13.     int len = 0;
  14.     int count[1000] = {0};
  15.     for (int i = 0; i < 10000000; i++) {
  16.         int dealer = randto(13);
  17.         int player = randto(13);
  18.         // if there's a tie nothing happens
  19.         if (player == dealer) {
  20.             continue;
  21.         }
  22.         // choose player > dealer
  23.         if (player > 6) {
  24.             if (player > dealer) {
  25.                 len++;              // correct, add 1 to len
  26.             } else {
  27.                 count[len]++;       // wrong, update count
  28.                 len = 0;            // and reset len
  29.             }
  30.         } else {
  31.         	// choose player < dealer
  32.             if (player < 6) {
  33.                 if (player < dealer) {
  34.                     len++;          // correct, add 1 to len
  35.                 } else {
  36.                     count[len]++;   // wrong, update count
  37.                     len = 0;        // and reset len
  38.                 }
  39.             } else {
  40.             	// player is exactly in the middle
  41.             	// choose randomly ... or (it's the same!) choose player < dealer
  42.                 if (player < dealer) {
  43.                     len++;          // correct, add 1 to len
  44.                 } else {
  45.                     count[len]++;   // wrong, update count
  46.                     len = 0;        // and reset len
  47.                 }
  48.             }
  49.         }
  50.     }
  51.     int countlow = 0;
  52.     int counthigh = 0;
  53.     for (int i = 0; i < 25; i++) countlow += count[i];
  54.     for (int i = 25; i < 1000; i++) counthigh += count[i];
  55.     printf("losses: %d; wins: %d. Percentage %.2f\n", countlow, counthigh, (counthigh * 100.0)/countlow);
  56.     return 0;
  57. }
  58.  
Success #stdin #stdout 0.33s 5388KB
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stdin
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Standard input is empty
stdout
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losses: 2126980; wins: 2956. Percentage 0.14
https://ideone.com/EwnLj0
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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