The type fmtflags is a bitmask type ([bitmask.types]). Setting its elements has the effects indicated in Table [tab:iostreams.fmtflags.effects].
Element | Effect(s) if set |
boolalpha | insert and extract bool type in alphabetic format |
dec | converts integer input or generates integer output in decimal base |
fixed | generate floating-point output in fixed-point notation |
hex | converts integer input or generates integer output in hexadecimal base |
internal | adds fill characters at a designated internal point in certain generated output, or identical to right if no such point is designated |
left | adds fill characters on the right (final positions) of certain generated output |
oct | converts integer input or generates integer output in octal base |
right | adds fill characters on the left (initial positions) of certain generated output |
scientific | generates floating-point output in scientific notation |
showbase | generates a prefix indicating the numeric base of generated integer output |
showpoint | generates a decimal-point character unconditionally in generated floating-point output |
showpos | generates a + sign in non-negative generated numeric output |
skipws | skips leading whitespace before certain input operations |
unitbuf | flushes output after each output operation |
uppercase | replaces certain lowercase letters with their uppercase equivalents in generated output |
Type fmtflags also defines the constants indicated in Table [tab:iostreams.fmtflags.constants].
Constant | Allowable values |
adjustfield | left | right | internal |
basefield | dec | oct | hex |
floatfield | scientific | fixed |