TP_7/exo3/exo3.c

   1 #include <stdio.h>
   2 #include <ctype.h>
   3
   4 // FIXME: Comment the code !!!
   5
   6 void swap(char* v1, char* v2) {
   7     if (v1 != v2) {
   8         char tmp = *v1;
   9         *v1 = *v2;
  10         *v2 = tmp;
  11     }
  12 }
  13
  14 int stringLength(const char* str) {
  15     int length;
  16
  17     for(length = 0; str[length] != '\0'; ++length);
  18     return length;
  19 }
  20
  21 // FIXME: this function have issues with non english characters
  22 void reverseString(char* str) {
  23     int length = stringLength(str);
  24
  25     for (int i = length - 1; i >= length/2; --i) {
  26         swap(&str[i], &str[(length - 1) - i]);
  27     }
  28 }
  29
  30 // FIXME: this function have issues with non english characters
  31 void permAlphaChar(char* str, int key) {
  32     char alphabet[26] = "abcdefghijklmnopqrstuvwxyz";
  33     int str_length = stringLength(str);
  34
  35     for (int i = 0; i < str_length; i++) {
  36         //if (str[i] == ' ') continue;
  37         for (int j = 0; j < 26; j++) {
  38             if (str[i] == alphabet[j]) {
  39                 str[i] = alphabet[(j+key) % 26];
  40                 break;
  41              } else if (str[i] == toupper(alphabet[j])) {
  42                 str[i] = toupper(alphabet[(j+key) % 26]);
  43                 break;
  44             }
  45         }
  46     }
  47 }
  48
  49 int main() {
  50     char rev_msg[] = "Bonjour le monde";
  51     int rev_length = stringLength(rev_msg);
  52     char perm_msg[] = "Bonjour a tous et toutes";
  53     int perm_length = stringLength(perm_msg);
  54
  55     printf("La chaine de caracteres a inverser est \"%s\" et a pour longueur %d caractere(s)\n", rev_msg, rev_length);
  56     reverseString(rev_msg);
  57     printf("La chaine inversee de caracteres est \"%s\"\n", rev_msg);
  58
  59     printf("\n");
  60
  61     printf("La chaine de caracteres a permuter est \"%s\" et a pour longueur %d caractere(s)\n", perm_msg, perm_length);
  62     permAlphaChar(perm_msg, 13);
  63     printf("La chaine permutee de caracteres est \"%s\"\n", perm_msg);
  64
  65     return 0;
  66 }