Padding stl strings in C++
I'm using std::string and need to left pad them to a given width. What is the recommended way to do this in C++?
Sample input:
123
pad to 10 characters.
Sample output:
123
(7 spaces in front of 123)
Answer
std::setw (setwidth) manipulator
std::cout << std::setw (10) << 77 << std::endl;
or
std::cout << std::setw (10) << "hi!" << std::endl;
outputs padded 77 and "hi!".
if you need result as string use instance of std::stringstream instead std::cout object.
ps: responsible header file <iomanip>