new examples of string initialisation

c_pointers/chapter_5.c

@@ -10,17 +10,49 @@ int main(void) {
     printf("%zu\n", sizeof('a'));
 
 
-
     // when a string is not a constant
     // doesn't work with gcc anymore, also with -Wno-deprecated-writable-strings
     // gives 'Bus error: 10'
     {
         char *tabHeader = "Sound";
-        *tabHeader = 'L';
+        //*tabHeader = 'L';
         printf("%s\n", tabHeader);
     }
 
 
+    // string initialization
+    {
+        // array of char
+        char header[] = "Media Player";
+        printf("%s\n", header);
+
+        header[0] = 'W';
+        header[1] = 'u';
+        header[2] = 'r';
+        header[3] = 's';
+        header[4] = 't';
+        header[5] = '\0';
+        printf("%s\n", header);
+
+        // pointer to char (with memory allocation)
+        char *headerPtr = malloc(strlen("Media Player") + 1);
+        strcpy(headerPtr, "Media Player");
+        printf("%s\n", headerPtr);
+
+        *headerPtr       = 'W';
+        *(headerPtr + 1) = 'u';
+        *(headerPtr + 2) = 'r';
+        *(headerPtr + 3) = 's';
+        *(headerPtr + 4) = 't';
+        *(headerPtr + 5) = '\0';
+        printf("%s\n", headerPtr);
+        for (size_t j = 0; j < strlen(headerPtr); j++) {
+            printf("headerPtr[%zu] Address: %p  Value: %c\n", j, &headerPtr[j], headerPtr[j]);
+        }
+        printf("\n");
+
+    }
+
     return 0;
 
 }