std::putchar (3) - Linux Man Pages
Defined in header <cstdio>
int putchar( int ch );
Writes a character ch to stdout. Internally, the character is converted to unsigned char just before being written.
Equivalent to putc(ch, stdout).
ch - character to be written
On success, returns the written character.
On failure, returns EOF and sets the error indicator (see ferror()) on stdout.
// Run this code