[cfe-dev] uint8_t not getting output to cout?

[Shriramana Sharma via cfe-dev]

Hello. Please see the following simple code:

#include <cstdint>
#include <cstdio>
#include <iostream>
int main()
{
    std::uint16_t y = 2019;
    std::uint8_t m = 2, d = 13;
    std::printf("%d-%d-%d\n", y, m, d);
    std::cout << y << '-' << m << '-' << d << std::endl;
    std::cout << int(y) << '-' << int(m) << '-' << int(d) << std::endl;
}

The above code outputs:

2019-2-13
2019- -
2019-2-13

The character on the second line after the hyphen is Unicode codepoint 0x0002!

The same behaviour happens with both Clang 6 and GCC 7.3.0 available
by default on my Kubuntu Bionic LTS system.

What is wrong with expecting std::cout to properly print uint8_t when
printf can do it?

-- 
Shriramana Sharma ஶ்ரீரமணஶர்மா श्रीरमणशर्मा 𑀰𑁆𑀭𑀻𑀭𑀫𑀡𑀰𑀭𑁆𑀫𑀸