14.2.10 Other Output Conversions

This section describes miscellaneous conversions for printf.

The ‘%c’ conversion prints a single character. The ‘-’ flag can be used to specify left-justification in the field, but no other flags are defined, and no precision or type modifier can be given. For example:

printf ("%c%c%c%c%c", "h", "e", "l", "l", "o");

prints ‘hello’.

The ‘%s’ conversion prints a string. The corresponding argument must be a string. A precision can be specified to indicate the maximum number of characters to write; otherwise characters in the string up to but not including the terminating null character are written to the output stream. The ‘-’ flag can be used to specify left-justification in the field, but no other flags or type modifiers are defined for this conversion. For example:

printf ("%3s%-6s", "no", "where");

prints ‘ nowhere ’ (note the leading and trailing spaces).

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https://octave.org/doc/v5.2.0/Other-Output-Conversions.html