
inlinestaticnoexcept 
Writes the text representation of the specified arguments list, to string using the specified format information.
fmt  A composite format string. 
args  arguments list to write using format. 
specifier  Output  Example 

d or i  Signed decimal integer  392 
u  Unsigned decimal integer  7235 
o  Unsigned octal  610 
x  Unsigned hexadecimal integer  7fa 
X  Unsigned hexadecimal integer (uppercase)  7FA 
f  Decimal floating point, lowercase  392.65 
F  Decimal floating point, lowercase (uppercase)  392.65 
e  Scientific notation (mantissa/exponent), lowercase  3.9265e+2 
E  Scientific notation (mantissa/exponent), uppercase  3.9265E+2 
g  Use the shortest representation: e or f  392.65 
G  Use the shortest representation: E or F  392.65 
a  Hexadecimal floating point, lowercase  0xc.90fep2 
A  Hexadecimal floating point, uppercase  0XC.90FEP2 
c  Character  a 
s  string of characters  sample 
p  Pointer address  b8000000 
n  Nothing printed. The corresponding argument must be a pointer to a signed int. The number of characters written so far is stored in the pointed location  
%  A % followed by another % character will write a single % to the stream.  % 
flags  description 

  Leftjustify within the given field width; Right justification is the default (see width subspecifier). 
+  Forces to prefix the result with a plus or minus sign (+ or ) even for positive numbers. By default, only negative numbers are preceded with a  sign. 
(space)  If no sign is going to be written, a blank space is inserted before the value. 
#  Used with o, x or X specifiers the value is prefixed with 0, 0x or 0X respectively for values different than zero. Used with a, A, e, E, f, F, g or G it forces the written output to contain a decimal point even if no more digits follow. By default, if no digits follow, no decimal point is written. 
0  Leftpads the number with zeroes (0) instead of spaces when padding is specified (see width subspecifier). 
width  description 

(number)  Minimum number of characters to be printed. If the value to be printed is shorter than this number, the result is padded with blank spaces. The value is not truncated even if the result is larger. 
*  The width is not specified in the format string, but as an additional integer value argument preceding the argument that has to be formatted. 
.precision  description 

.number  For integer specifiers (d, i, o, u, x, X): precision specifies the minimum number of digits to be written. If the value to be written is shorter than this number, the result is padded with leading zeros. The value is not truncated even if the result is longer. A precision of 0 means that no character is written for the value 0. For a, A, e, E, f and F specifiers: this is the number of digits to be printed after the decimal point (by default, this is 6). For g and G specifiers: This is the maximum number of significant digits to be printed. For s: this is the maximum number of characters to be printed. By default all characters are printed until the ending null character is encountered. If the period is specified without an explicit value for precision, 0 is assumed. 
.*  The precision is not specified in the format string, but as an additional integer value argument preceding the argument that has to be formatted. 
length  d i  u o x X  f F e E g G a A  c  s  p  n 

(none)  int  unsigned int  double  int  char8*  void*  int* 
hh  signed char8  unsigned char8  unsigned char8*  
h  short int  unsigned short int  short int*  
l  long int  unsigned long int  win_t  wchar*  long int*  
ll  long long int  unsigned long long int  long long int*  
j  intmax_t  uintmax_t  intmax_t*  
z  size_t  size_t  size_t*  
t  ptrdiff_t  ptrdiff_t  ptrdiff_t*  
L  long double 