Please clarify your intent.
As mentioned earlier, "Hello" is a string -- it does not have a char value. However, each individual character in the string (including the terminating null) has a character value.
Do you want
j to be:
- The char value of the first letter of the string ('H')?
- The sum of the char values of all letters in the string (with or without the terminating null)?
- A count of the number of characters in the string (with or without the terminating null)?
- Something else?
By the way, the C Standard does not mandate any particular character encoding. That is, you cannot be completely certain what numeric value your compiler will use to encode a particular character. That said, ASCII encoding is very common.