I/O Format Specifiers for Writing Characters

Character Data -- %c

A character argument has a format specifier of the following form:

%[flags] [width] [.precision] c

Modifier	Interpretation
Default Functionality	The argument is interpreted as a single-byte character. The character is sent to the device without change.
flags -, 0	Controls justification and padding of the output, as follows: - - left aligns the result with the given field width. 0 - pads with zeros until the width is reached. If 0 and - appear together, the 0 is ignored.
width	Minimum field width of the output string. An asterisk (*) may be present in lieu of an integer width modifier, in which case an extra int argument supplies the value.
precision	Maximum number of characters to send. An asterisk (*) may be present in lieu of an integer precision modifier, in which case an extra int argument supplies the value.

Example -- Single-character output

C++

Copy

HRESULT hr = S_OK;

char ch = 'A';

hr = io.Printf(_T("%c"), ch);                 // Sends "A"

// Field width specifies minimum width, right justify and pad to the left
hr = io.Printf(_T("%5c"), ch);                // Sends "    A"

// Left justify and pad to the right, field width specified with a variable
int nWidth = 5;
hr = io.Printf(_T("%-*c"), nWidth, ch);       // Sends "A    "

Other Resources

Printf