using fmtflags = T1;
The type fmtflags is a bitmask type. Setting its elements has the effects indicated in Table 107.
| 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 |