| 1 | #include <stdio.h> |
| 2 | |
| 3 | int stringLength(const char* str) { |
| 4 | int result = 0; |
| 5 | |
| 6 | while (str[result] != '\0') { |
| 7 | ++result; |
| 8 | } |
| 9 | |
| 10 | return result; |
| 11 | } |
| 12 | |
| 13 | void swap(char* v1, char* v2) { |
| 14 | char temp = *v1; |
| 15 | *v1 = *v2; |
| 16 | *v2 = temp; |
| 17 | } |
| 18 | |
| 19 | void reverseString(char* str) { |
| 20 | int length = stringLength(str); |
| 21 | int halfLength = length / 2; |
| 22 | |
| 23 | for (int charId = 0; charId < halfLength; ++charId) { |
| 24 | swap(&str[charId], &str[length - charId - 1]); |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | int main() { |
| 29 | char msg[] = "Votre message"; |
| 30 | printf("Initial value: \"%s\"\n", msg); |
| 31 | reverseString(msg); |
| 32 | printf("Reversed : \"%s\"\n", msg); |
| 33 | } |