Produce an integer constant by placing the characters of a multi-character character-constant in the specified byte order. You can substitute one of the following values for o:
low: place the characters of a multi-character character-constant in low-to-high byte order.
high: place the characters of a multi-character character-constant in high-to-low byte order.
default: place the characters of a multi-character character-constant in an order determined by the compilation mode B.2.63 -X[c|a|t|s]. For more information, see 2.1.2 Character Constants.