Zilog Z8F0130 - Manual (Page 478)

Appendix B. C Standard Library UM013037-1212
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printf Conversion Characters
d,i,o,u,x,X The int argument is converted to signed decimal (d or i), unsigned octal
(o), unsigned decimal (u), or unsigned hexadecimal notation (x or X); the
letters abcdef are used for x conversion and the letters ABCDEF for X
conversion. The precision specifies the minimum number of digits to
appear; if the value being converted can be represented in fewer digits, it
is expanded with leading zeros. The default precision is 1. The result of
converting a zero value with a precision of zero is no characters.
f The double argument is converted to decimal notation in the style [-
]ddd.ddd, where the number of digits after the decimal point is equal to the
precision specification. If the precision is missing, it is taken as 6; if the
precision is explicitly zero, no decimal point appears. If a decimal point
appears, at least one digit appears before it. The value is rounded to the
appropriate number of digits.
e,E The double argument is converted in the style [-]d.ddde+dd, where there is
one digit before the decimal point and the number of digits after it is equal
to the precision; when the precision is missing, six digits are produced; if
the precision is zero, no decimal point appears. The value is rounded to
the appropriate number of digits. The E conversion character produces a
number with E instead of e introducing the exponent. The exponent
always contains at least two digits. However, if the magnitude to be
converted is greater than or equal to lE+100, additional exponent digits are
written as necessary.
g,G The double argument is converted in style f or e (or in style E in the case of
a G conversion character), with the precision specifying the number of
significant digits. The style used depends on the value converted; style e is
used only if the exponent resulting from the conversion is less than -4 or
greater than the precision. Trailing zeros are removed from the result; a
decimal point appears only if it is followed by a digit.
c The int argument is converted to an unsigned char, and the resulting
character is written.
s The argument is taken to be a (const char *) pointer to a string. Characters
from the string are written up to, but not including, the terminating null
character, or until the number of characters indicated by the precision are
written. If the precision is missing it is taken to be arbitrarily large, so all
characters before the first null character are written.
p The argument is taken to be a (const void) pointer to an object. The value
of the pointer is converted to a sequence of hex digits.
n The argument is taken to be an (int) pointer to an integer into which is
written the number of characters written to the output stream so far by this
call to printf. No argument is converted.
% A % is written. No argument is converted.