Add count_chars

.gitignore

@@ -42,3 +42,4 @@ calcul-somme-tableau
 puissance
 is_a_number
 val_presente_ou_non
+count_chars

programmation-c-cpp/tp5/count_chars.c

@@ -0,0 +1,38 @@
+/* Count chars */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int count_chars(char, char*);
+
+int main() {
+    char *chaine = "Hello world!";
+    char caractere;
+    int count;
+
+    caractere = 'e';
+    count = count_chars(caractere, chaine);
+    printf("Chaine: %s\n", chaine);
+    printf("Le caractère '%c' est présent %d fois.\n", caractere, count);
+
+    caractere = 'l';
+    count = count_chars(caractere, chaine);
+    printf("Chaine: %s\n", chaine);
+    printf("Le caractère '%c' est présent %d fois.\n", caractere, count);
+
+    return 0;
+}
+
+int count_chars(char caractere, char *chaine) {
+    int i = 0;
+    int count = 0;
+
+    while (chaine[i] != '\0') {
+        if (chaine[i] == caractere) {
+            count++;
+        }
+        i++;
+    }
+
+    return count;
+}