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  1. #include <stdio.h>
  2.  
  3. #define REORDER3(b1, b2, b3, a1, a2, a3 )   \
  4. {                                           \
  5.   typeof(a1) _tmp[] = {a1, a2, a3};         \
  6.   b1 = _tmp[0]; b2 = _tmp[1]; b3 = _tmp[2]; \
  7. } while ( 0 )
  8.  
  9. #define uintprint3(a) printf("%u %u %u\n", a[0], a[1], a[2])
  10.  
  11.  
  12. void sort3( unsigned int a[3] )
  13. {
  14.  
  15.   if (a[0] > a[1])
  16.     if (a[1] > a[2])
  17.       {
  18.         REORDER3 (
  19.                   a[0], a[1], a[2],
  20.                   a[2], a[1], a[0]);
  21.         return;
  22.       }
  23.     else
  24.       if (a[0] > a[2])
  25.         {
  26.           REORDER3 (
  27.                     a[0], a[1], a[2],
  28.                     a[1], a[2], a[0]);
  29.           return;
  30.         }
  31.       else
  32.         {
  33.           REORDER3 (
  34.                     a[0], a[1], a[2],
  35.                     a[1], a[0], a[2]);
  36.           return;
  37.         }
  38.   else
  39.     if (a[1] <= a[2])
  40.       return; //NO REORDER
  41.     else
  42.       if (a[0] <= a[2])
  43.         {
  44.           REORDER3 (
  45.                     a[0], a[1], a[2],
  46.                     a[0], a[2], a[1] );
  47.           return;
  48.         }
  49.       else
  50.         {
  51.           REORDER3 (
  52.                     a[0], a[1], a[2],
  53.                     a[2], a[0], a[1] );
  54.           return;
  55.         }
  56. }
  57.  
  58. int main(void)
  59. {
  60.   unsigned int a[] = {0, 1, 2};
  61.   unsigned int b[] = {0, 2, 1};
  62.   unsigned int c[] = {1, 2, 0};
  63.   unsigned int d[] = {1, 0, 2};
  64.   unsigned int e[] = {2, 0, 1};
  65.   unsigned int f[] = {2, 1, 0};
  66.   sort3(a); sort3(b); sort3(c); sort3(d); sort3(e); sort3(f);
  67.  
  68.   uintprint3(a);
  69.   uintprint3(b);
  70.   uintprint3(c);
  71.   uintprint3(d);
  72.   uintprint3(e);
  73.   uintprint3(f);
  74.   return 0;
  75. }
Success #stdin #stdout 0s 1832KB
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stdin
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Standard input is empty
stdout
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0 1 2
0 1 2
0 1 2
0 1 2
0 1 2
0 1 2
https://ideone.com/Ab7dht
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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