Char type conversion int type , when , and how it is not an assignment ASCII code ? ?

If the value is a char is converted into ASCII 49 , but the value I want to convert or a how to do ?
------ Solution ---------------------------------------- ----

  
  char c = '1';
  int i = (int) (c - '0');
  System.out.println(i);
  

------ For reference only ---------------------------- -----------

  		char c = '1';
  		int result = Integer.valueOf(String.valueOf(c));
  		System.out.println(result);