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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <time.h>
  4.  
  5. void swap(int *a, int *b)
  6. {
  7.     int temp = *a;
  8.     *a = *b;
  9.     *b = temp;
  10. }
  11.  
  12. void genarate(int arr[])
  13. {
  14.     int range = 10;
  15.     int i;
  16.  
  17.     for(i = 0; i < 10; ++i)
  18.         arr[i] = i;
  19.  
  20.     while(range)
  21.     {
  22.         i = rand() % range;
  23.         --range;
  24.         swap(&arr[i], &arr[range]);
  25.     }
  26. }
  27.  
  28. void pick_four(int arr[], int result[])
  29. {
  30.     int i;
  31.     int n;
  32.     if(arr[0] == 0)
  33.     {
  34.         n = (rand() % 9) + 1;
  35.         swap(&arr[0], &arr[n]);
  36.  
  37.         for(i = 0; i < 4; ++i)
  38.             result[i] = arr[i];
  39.  
  40.         swap(&arr[0], &arr[n]);
  41.     }
  42.     else
  43.     {
  44.         for(i = 0; i < 4; ++i)
  45.             result[i] = arr[i];
  46.     }
  47. }
  48.  
  49. int main(void)
  50. {
  51.     int arr[10];
  52.     int result[4];
  53.     int i;
  54.  
  55.  
  56.     srand((unsigned int)time(NULL));
  57.  
  58.     genarate(arr);
  59.  
  60.     pick_four(arr, result);
  61.  
  62.     for(i = 0; i < 4; ++i)
  63.         printf("%d", result[i]);
  64.     printf("\n");
  65.  
  66.     return 0;
  67. }
Success #stdin #stdout 0.02s 1720KB
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https://ideone.com/bkQsV8
language:
C (gcc 8.3)
created:
13 years ago
visibility:
secret

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