| 1 | #include <stdlib.h> |
| 2 | #include <stdio.h> |
| 3 | #include <stdbool.h> |
| 4 | #include <string.h> |
| 5 | |
| 6 | #define LEN_MAX 40 |
| 7 | |
| 8 | bool palindrome_iter(char *mot, int longeur) |
| 9 | { |
| 10 | int i = 0; |
| 11 | int j = longeur - 1; |
| 12 | |
| 13 | while (i <= j) { |
| 14 | if (mot[i] != mot[j]) { |
| 15 | return false; |
| 16 | } |
| 17 | i++; |
| 18 | j--; |
| 19 | } |
| 20 | return true; |
| 21 | } |
| 22 | |
| 23 | bool palindrome_rec_aux(char *mot, int i, int j) |
| 24 | { |
| 25 | if (i >= j) { |
| 26 | return true; |
| 27 | } |
| 28 | if (mot[i] != mot[j]) { |
| 29 | return false; |
| 30 | } |
| 31 | return palindrome_rec_aux(mot, i + 1, j - 1); |
| 32 | } |
| 33 | |
| 34 | bool palindrome_rec(char *mot, int longueur) |
| 35 | { |
| 36 | return palindrome_rec_aux(mot, 0, longueur - 1); |
| 37 | } |
| 38 | |
| 39 | |
| 40 | int main() |
| 41 | { |
| 42 | char mot[LEN_MAX]; |
| 43 | |
| 44 | printf("Saisir un mot\n"); |
| 45 | scanf("%s", mot); |
| 46 | if (palindrome_rec(mot, strlen(mot))) |
| 47 | printf("%s est un palindrome\n", mot); |
| 48 | else |
| 49 | printf("%s n'est pas un palindrome\n", mot); |
| 50 | |
| 51 | return 0; |
| 52 | } |