22 General utilities library [utilities]

22.14 Formatting [format]

22.14.2 Format string [format.string] Standard format specifiers [format.string.std]

Table 69: Meaning of type options for charT[tab:format.type.char]
none, c
Copies the character to the output.
b, B, d, o, x, X
As specified in Table 68 with value converted to the unsigned version of the underlying type.
Copies the escaped character ([format.string.escaped]) to the output.