std::ios_base::flags
科技促进发展：监督办[医]基地：：旗帜
| fmtflags flags() const; | (1) | |
|---|---|---|
| fmtflags flags( fmtflags flags | (2) | |
管理格式标志。
1%29返回当前格式设置。
2%29用给定的设置替换当前设置。
参数
| flags | - | new formatting setting. It can be a combination of the following constants: Constant Explanation dec use decimal base for integer I/O: see std::dec oct use octal base for integer I/O: see std::oct hex use hexadecimal base for integer I/O: see std::hex basefield dec|oct|hex|0. Useful for masking operations left left adjustment (adds fill characters to the right): see std::left right right adjustment (adds fill characters to the left): see std::right internal internal adjustment (adds fill characters to the internal designated point): see std::internal adjustfield left|right|internal. Useful for masking operations scientific generate floating point types using scientific notation, or hex notation if combined with fixed: see std::scientific fixed generate floating point types using fixed notation, or hex notation if combined with scientific: see std::fixed floatfield scientific|fixed|(scientific|fixed)|0. Useful for masking operations boolalpha insert and extract bool type in alphanumeric format: see std::boolalpha showbase generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see std::showbase showpoint generate a decimal-point character unconditionally for floating-point number output: see std::showpoint showpos generate a + character for non-negative numeric output: see std::showpos skipws skip leading whitespace before certain input operations: see std::skipws unitbuf flush the output after each output operation: see std::unitbuf uppercase replace certain lowercase letters with their uppercaseequivalents in certain output output operations: see std::uppercase | Constant | Explanation | dec | use decimal base for integer I/O: see std::dec | oct | use octal base for integer I/O: see std::oct | hex | use hexadecimal base for integer I/O: see std::hex | basefield | dec|oct|hex|0. Useful for masking operations | left | left adjustment (adds fill characters to the right): see std::left | right | right adjustment (adds fill characters to the left): see std::right | internal | internal adjustment (adds fill characters to the internal designated point): see std::internal | adjustfield | left|right|internal. Useful for masking operations | scientific | generate floating point types using scientific notation, or hex notation if combined with fixed: see std::scientific | fixed | generate floating point types using fixed notation, or hex notation if combined with scientific: see std::fixed | floatfield | scientific|fixed|(scientific|fixed)|0. Useful for masking operations | boolalpha | insert and extract bool type in alphanumeric format: see std::boolalpha | showbase | generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see std::showbase | showpoint | generate a decimal-point character unconditionally for floating-point number output: see std::showpoint | showpos | generate a + character for non-negative numeric output: see std::showpos | skipws | skip leading whitespace before certain input operations: see std::skipws | unitbuf | flush the output after each output operation: see std::unitbuf | uppercase | replace certain lowercase letters with their uppercaseequivalents in certain output output operations: see std::uppercase |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Constant | Explanation | |||||||||||||||||||||||||||||||||||||||
| dec | use decimal base for integer I/O: see std::dec | |||||||||||||||||||||||||||||||||||||||
| oct | use octal base for integer I/O: see std::oct | |||||||||||||||||||||||||||||||||||||||
| hex | use hexadecimal base for integer I/O: see std::hex | |||||||||||||||||||||||||||||||||||||||
| basefield | dec|oct|hex|0. Useful for masking operations | |||||||||||||||||||||||||||||||||||||||
| left | left adjustment (adds fill characters to the right): see std::left | |||||||||||||||||||||||||||||||||||||||
| right | right adjustment (adds fill characters to the left): see std::right | |||||||||||||||||||||||||||||||||||||||
| internal | internal adjustment (adds fill characters to the internal designated point): see std::internal | |||||||||||||||||||||||||||||||||||||||
| adjustfield | left|right|internal. Useful for masking operations | |||||||||||||||||||||||||||||||||||||||
| scientific | generate floating point types using scientific notation, or hex notation if combined with fixed: see std::scientific | |||||||||||||||||||||||||||||||||||||||
| fixed | generate floating point types using fixed notation, or hex notation if combined with scientific: see std::fixed | |||||||||||||||||||||||||||||||||||||||
| floatfield | scientific|fixed|(scientific|fixed)|0. Useful for masking operations | |||||||||||||||||||||||||||||||||||||||
| boolalpha | insert and extract bool type in alphanumeric format: see std::boolalpha | |||||||||||||||||||||||||||||||||||||||
| showbase | generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see std::showbase | |||||||||||||||||||||||||||||||||||||||
| showpoint | generate a decimal-point character unconditionally for floating-point number output: see std::showpoint | |||||||||||||||||||||||||||||||||||||||
| showpos | generate a + character for non-negative numeric output: see std::showpos | |||||||||||||||||||||||||||||||||||||||
| skipws | skip leading whitespace before certain input operations: see std::skipws | |||||||||||||||||||||||||||||||||||||||
| unitbuf | flush the output after each output operation: see std::unitbuf | |||||||||||||||||||||||||||||||||||||||
| uppercase | replace certain lowercase letters with their uppercaseequivalents in certain output output operations: see std::uppercase |
返回值
调用函数之前的格式标志。
例
另见
| setf | sets specific format flag (public member function) |
|---|---|
| unsetf | clears specific format flag (public member function) |
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