source: trunk/Softwares/Basic_test/src/c/func_premier.c @ 89

Last change on this file since 89 was 81, checked in by rosiere, 17 years ago
  • Finish Environment (and test)
  • Continue predictor_unit
  • Add external tools
  • svn keyword "Id" set
  • Property svn:keywords set to Id
File size: 575 bytes
Line 
1#include "func_math.h"
2#include "func_premier.h"
3
4//-----[ Premier ]---------------------------------------------------------
5
6unsigned int premier(unsigned int x)
7{
8  unsigned int it;
9
10  if (x <= 0)
11    return 0;
12 
13  if (x <= 2)
14    return 1;
15
16  for(it=2; it <= (x/2); it++)
17    if (modulo(x,it) == 0)
18      return 0;
19 
20  return 1;
21}
22
23unsigned int n_premier(unsigned int nieme_premier)
24{
25  unsigned int nb_find  = 0;
26  unsigned int res      = 1;
27  while (nb_find < nieme_premier)
28    {
29      res ++;
30      if (premier(res) == 1)
31        nb_find ++;
32    }
33  return res;
34}
35
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