C++ std::iomanip std::setiosflags
Example
When used in an expression out << setiosflags(mask) or in >> setiosflags(mask), sets all format flags of the stream out or in as specified by the mask.
List of all std::ios_base::fmtflags :
dec- use decimal base for integer I/Ooct- use octal base for integer I/Ohex- use hexadecimal base for integer I/Obasefield-dec|oct|hex|0useful for masking operationsleft- left adjustment(add fill characters to the right)right- right adjustment (adds fill characters to the left)internal- internal adjustment (adds fill characters to the internal designated point)adjustfield-left|right|internal. Useful for masking operationsscientific- generate floating point types using scientific notation, or hex notation if combined with fixedfixed- generate floating point types using fixed notation, or hex notation if combined with scientificfloatfield-scientific|fixed|(scientific|fixed)|0. Useful for masking operationsboolalpha- insert and extractbooltype in alphanumeric formatshowbase- generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/Oshowpoint- generate a decimal-point character unconditionally for floating-point number outputshowpos- generate a+character for non-negative numeric outputskipws- skip leading whitespace before certain input operationsunitbufflush the output after each output operationuppercase- replace certain lowercase letters with their uppercase equivalents in certain output output operations
Example of manipulators:
#include <iostream>
#include <string>
#include<iomanip>
int main()
{
int l_iTemp = 47;
std::cout<< std::resetiosflags(std::ios_base::basefield);
std::cout<<std::setiosflags( std::ios_base::oct)<<l_iTemp<<std::endl;
//output: 57
std::cout<< std::resetiosflags(std::ios_base::basefield);
std::cout<<std::setiosflags( std::ios_base::hex)<<l_iTemp<<std::endl;
//output: 2f
std::cout<<std::setiosflags( std::ios_base::uppercase)<<l_iTemp<<std::endl;
//output 2F
std::cout<<std::setfill('0')<<std::setw(12);
std::cout<<std::resetiosflags(std::ios_base::uppercase);
std::cout<<std::setiosflags( std::ios_base::right)<<l_iTemp<<std::endl;
//output: 00000000002f
std::cout<<std::resetiosflags(std::ios_base::basefield|std::ios_base::adjustfield);
std::cout<<std::setfill('.')<<std::setw(10);
std::cout<<std::setiosflags( std::ios_base::left)<<l_iTemp<<std::endl;
//output: 47........
std::cout<<std::resetiosflags(std::ios_base::adjustfield)<<std::setfill('#');
std::cout<<std::setiosflags(std::ios_base::internal|std::ios_base::showpos);
std::cout<<std::setw(10)<<l_iTemp<<std::endl;
//output +#######47
double l_dTemp = -1.2;
double pi = 3.14159265359;
std::cout<<pi<<" "<<l_dTemp<<std::endl;
//output +3.14159 -1.2
std::cout<<std::setiosflags(std::ios_base::showpoint)<<l_dTemp<<std::endl;
//output -1.20000
std::cout<<setiosflags(std::ios_base::scientific)<<pi<<std::endl;
//output: +3.141593e+00
std::cout<<std::resetiosflags(std::ios_base::floatfield);
std::cout<<setiosflags(std::ios_base::fixed)<<pi<<std::endl;
//output: +3.141593
bool b = true;
std::cout<<std::setiosflags(std::ios_base::unitbuf|std::ios_base::boolalpha)<<b;
//output: true
return 0;
}
