How can I pad an int with leading zeros when using cout

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With the following,

#include <iomanip>
#include <iostream>

int main()
{
    std::cout << std::setfill('0') << std::setw(5) << 25;
}

the output will be

00025

setfill is set to the space character (' ') by default. setw sets the width of the field to be printed, and that’s it.

If you are interested in knowing how the to format output streams in general, I wrote an answer for another question, hope it is useful:
Formatting C++ Console Output.

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