Left of the dot precision

Question

What I'm trying to is to write something like this

file << someFunction(5) << hex << 3;

And to get an output like this 00003 instead of 3 (and 300 will be 00300, etc)

Note:- Sorry if this was asked before, I don't know what term to search for to get this

EDIT:- I mean the zero's to the left, i included the hex part just to be clear I want it to be compatible with this format

Answer 1

I believe this is what you mean.

#include <iostream>
#include <iomanip>
int main()
{
   std::cout << std::setw(5) << std::setfill('0') << 3 << '\n';
   return 0;
}

Output

00003

Links setw, setfill.

Edit: Also, see std::internal at this question.

Answer 2

Use

file << setfill('0') << setw(5) << 3;

to get 00003 instead of 3

Answer 3

iomanip is what you need to search for.

#include <iomanip>

then

file << someFunction(5) << hex << setw(5) << setfill('0') << 3 << endl;