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| author | Charles <sircharlesaze@gmail.com> | 2019-08-06 16:56:43 +0200 |
|---|---|---|
| committer | Charles <sircharlesaze@gmail.com> | 2019-08-06 16:56:43 +0200 |
| commit | 056a88ee9c2c9e26f9712d14c645e367d851f394 (patch) | |
| tree | 52b54df3e809e1526325dd9123078a9cc01e9831 /c05/ex06/ft_is_prime.c | |
| parent | e534578eecebd27c4e7e235ce85961446e6c2e43 (diff) | |
| download | piscine-056a88ee9c2c9e26f9712d14c645e367d851f394.tar.gz piscine-056a88ee9c2c9e26f9712d14c645e367d851f394.tar.bz2 piscine-056a88ee9c2c9e26f9712d14c645e367d851f394.zip | |
c05
- primality test correction for ft_is_prime and ft_find_next_prime
- queens puzzle solved with backtracking (similar to rush01)
Diffstat (limited to 'c05/ex06/ft_is_prime.c')
| -rw-r--r-- | c05/ex06/ft_is_prime.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/c05/ex06/ft_is_prime.c b/c05/ex06/ft_is_prime.c index 3c83061..658fefb 100644 --- a/c05/ex06/ft_is_prime.c +++ b/c05/ex06/ft_is_prime.c @@ -13,7 +13,6 @@ int ft_is_prime(int nb) { long unsigned int i; - long unsigned int nbu; if (nb <= 1) return (0); @@ -21,15 +20,12 @@ int ft_is_prime(int nb) return (1); if (nb % 2 == 0 || nb % 3 == 0) return (0); - i = 1; - nbu = nb; - while (i * i <= nbu) // ne fonctionne pas de 7 a 41 + i = 5; + while (i * i <= nb) { - if (nbu % (i * 6 - 1) == 0) - return (0); - if (nbu % (i * 6 + 1) == 0) - return (0); - i += 1; + if (nb % i == 0 || nb % (i + 2) == 0) + return (0); + i += 6; } return (1); } |