Padding stl strings in C++
问题 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) 回答1: 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>