Using atoi with char

Question

Is there a way of converting a char into a string in C?

I'm trying to do so like this:

   char *array;

   array[0] = '1';

   int x = atoi(array);

   printf("%d",x);

Answer 1

How about:

   char arr[] = "X";
   int x;
   arr[0] = '9';
   x = atoi(arr);
   printf("%d",x);