Zilog EZ80F916 - Manual (Page 373)

UM014423-0607 C Standard Library
ZiLOG Developer Studio II
eZ80Acclaim! ® User Manual
353
Example
double x=2.0;
double y=3.0;
double res;
res=pow(x,y);
printf
Writes output to the stream pointed to by stdout, under control of the string pointed to by
format that specifies how subsequent arguments are converted for output.
A format string contains two types of objects: plain characters, which are copied
unchanged to stdout, and conversion specifications, each of which fetch zero or more sub-
sequent arguments. The results are undefined if there are insufficient arguments for the
format. If the format is exhausted while arguments remain, the excess arguments are eval-
uated but otherwise ignored. The
printf function returns when the end of the format
string is encountered.
Each conversion specification is introduced by the character %. After the %, the following
appear in sequence:
•
Zero or more flags that modify the meaning of the conversion specification.
•
An optional decimal integer specifying a minimum field width. If the converted value
has fewer characters than the field width, it is padded on the left (or right, if the left
adjustment flag, described later, has been given) to the field width. The padding is
with spaces unless the field width integer starts with a zero, in which case the padding
is with zeros.
•
An optional precision that gives the minimum number of digits to appear for the d, i,
o, u, x, and X conversions, the number of digits to appear after the decimal point for e,
E, and f conversions, the maximum number of significant digits for the g and G
conversions, or the maximum number of characters to be written from a string in s
conversion. The precision takes the form of a period (.) followed by an optional
decimal integer; if the integer is omitted, it is treated as zero. The amount of padding
specified by the precision overrides that specified by the field width.
•
An optional h specifies that a following d, i, o, u, x, or X conversion character applies
to a short_int or unsigned_short_int argument (the argument has been promoted
according to the integral promotions, and its value is converted to short_int or
unsigned_short_int before printing). An optional l (ell) specifies that a following d, i,
o, u, x or X conversion character applies to a long_int or unsigned_long_int argument.
An optional L specifies that a following e, E, f, g, or G conversion character applies to
a long_double argument. If an h, l, or L appears with any other conversion character, it
is ignored.
•
A character that specifies the type of conversion to be applied.