std::ios_base::fmtflags
From cppreference.com
typedef /*implementation defined*/ fmtflags;
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static constexpr fmtflags dec = /*implementation defined*/
static constexpr fmtflags oct = /*implementation defined*/
static constexpr fmtflags hex = /*implementation defined*/
static constexpr fmtflags basefield = dec | oct | hex;
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static constexpr fmtflags left = /*implementation defined*/
static constexpr fmtflags right = /*implementation defined*/
static constexpr fmtflags internal = /*implementation defined*/
static constexpr fmtflags adjustfield = left | right | internal;
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static constexpr fmtflags scientific = /*implementation defined*/
static constexpr fmtflags fixed = /*implementation defined*/
static constexpr fmtflags floatfield = scientific | fixed;
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static constexpr fmtflags boolalpha = /*implementation defined*/
static constexpr fmtflags showbase = /*implementation defined*/
static constexpr fmtflags showpoint = /*implementation defined*/
static constexpr fmtflags showpos = /*implementation defined*/
static constexpr fmtflags skipws = /*implementation defined*/
static constexpr fmtflags unitbuf = /*implementation defined*/
static constexpr fmtflags uppercase = /*implementation defined*/
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Specifies available formatting flags. It is a BitmaskType. The following constants are defined:
| 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. Useful for masking operations
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| 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
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| scientific | generate floating point types using scientific notation, or hex notation if combined with fixed: see std::scientific
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| fixed | generate floating point types using fixed notation, or hex notation if combined with scientific: see std::fixed
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| floatfield | scientific | fixed. Useful for masking operations
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| boolalpha | insert and extract bool type in alphanumeric format: see std::boolalpha
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| 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
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| 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 uppercase equivalents in certain output operations: see std::uppercase |
Example
The following example shows several different ways to print the same result.
Run this code
#include <iostream>
int main()
{
const int num = 150;
// using fmtflags as class member constants:
std::cout.setf(std::ios_base::hex, std::ios_base::basefield);
std::cout.setf(std::ios_base::showbase);
std::cout << num << '\n';
// using fmtflags as inherited class member constants:
std::cout.setf (std::ios::hex, std::ios::basefield);
std::cout.setf (std::ios::showbase);
std::cout << num << '\n';
// using fmtflags as object member constants:
std::cout.setf(std::cout.hex, std::cout.basefield);
std::cout.setf(std::cout.showbase);
std::cout << num << '\n';
// using fmtflags as a type:
std::ios_base::fmtflags ff;
ff = std::cout.flags();
ff &= ~std::cout.basefield; // unset basefield bits
ff |= std::cout.hex; // set hex
ff |= std::cout.showbase; // set showbase
std::cout.flags(ff);
std::cout << num << '\n';
// not using fmtflags, but using manipulators:
std::cout << std::hex << std::showbase << num << '\n';
}
Output:
0x96
0x96
0x96
0x96
0x96