std::cout << std::fixed << std::setw(11) << std::setprecision(6) << my_double; You need to add #include <iomanip> You need stream manipulators You may “fill” the empty places with whatever char you want. Like this: std::cout << std::fixed << std::setw(11) << std::setprecision(6) << std::setfill(‘0’) << my_double;
You need to include #include <string> #include <iostream>
The standard streams have a boolalpha flag that determines what gets displayed — when it’s false, they’ll display as 0 and 1. When it’s true, they’ll display as false and true. There’s also an std::boolalpha manipulator to set the flag, so this: #include <iostream> #include <iomanip> int main() { std::cout<<false<<“\n”; std::cout << std::boolalpha; std::cout<<false<<“\n”; return … Read more
Use: #include <iostream> … std::cout << std::hex << a; There are many other options to control the exact formatting of the output number, such as leading zeros and upper/lower case.
Just insert std::flush: std::cout << “Beginning computations…” << std::flush; Also note that inserting std::endl will also flush after writing a newline.
The direct answer is that yes, that’s okay. A lot of people have thrown around various ideas of how to improve speed, but there seems to be quite a bit of disagreement over which is most effective. I decided to write a quick test program to get at least some idea of which techniques did … Read more
Make sure you flush the stream. This is required because the output streams are buffered and you have no guarantee over when the buffer will be flushed unless you manually flush it yourself. std::cout << “Hello” << std::endl; std::endl will output a newline and flush the stream. Alternatively, std::flush will just do the flush. Flushing … Read more
Use: cout << “a is ” << hex << (int) a <<“; b is ” << hex << (int) b << endl; And if you want padding with leading zeros then: #include <iomanip> … cout << “a is ” << setw(2) << setfill(‘0’) << hex << (int) a ; As we are using C-style casts, … Read more
The ISO C++ standard way to do it is to #include <iomanip> and use io manipulators like std::setw. However, that said, those io manipulators are a real pain to use even for text, and are just about unusable for formatting numbers (I assume you want your dollar amounts to line up on the decimal, have … Read more
Compile the program with: g++ -Wall -Wextra -Werror -c main.cpp -o main.o ^^^^^^^^^^^^^^^^^^^^ <- For listing all warnings when your code is compiled. as cout is present in the C++ standard library, which would need explicit linking with -lstdc++ when using gcc; g++ links the standard library by default. With gcc, (g++ should be preferred … Read more