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http://www.cplusplus.com/reference/clibrary/cstdio/sprintf/

sprintf

function

<cstdio>

int sprintf ( char * str, const char * format, ... );

Write formatted data to string

Writes into the array pointed by str a C string consisting on a sequence of data formatted as the format argument specifies. After the format parameter, the function expects at least as many additional arguments as specified in format.
This function behaves exactly as printf does, but writing its results to a string instead of stdout. The size of the array passed as str should be enough to contain the entire formatted string.

Parameters

str

Pointer to an array of char elements where the resulting C string is stored.

format

C string that contains the text to be written to the buffer.
It can optionally contain embedded format tags that are substituted by the values specified in subsequent argument(s) and formatted as requested.
The number of arguments following the format parameters should at least be as much as the number of format tags.
The format tags follow this prototype:

%[flags][width][.precision][length]specifier

Where specifier is the most significant one and defines the type and the interpretation of the value of the coresponding argument:

specifier	Output	Example
c	Character	a
d or i	Signed decimal integer	392
e	Scientific notation (mantise/exponent) using e character	3.9265e+2
E	Scientific notation (mantise/exponent) using E character	3.9265E+2
f	Decimal floating point	392.65
g	Use the shorter of %e or %f	392.65
G	Use the shorter of %E or %f	392.65
o	Signed octal	610
s	String of characters	sample
u	Unsigned decimal integer	7235
x	Unsigned hexadecimal integer	7fa
X	Unsigned hexadecimal integer (capital letters)	7FA
p	Pointer address	B800:0000
n	Nothing printed. The argument must be a pointer to a signed int, where the number of characters written so far is stored.
%	A % followed by another % character will write % to the string.

The tag can also contain flags, width, .precision and modifiers sub-specifiers, which are optional and follow these specifications:

flags	description
-	Left-justify within the given field width; Right justification is the default (see width sub-specifier).
+	Forces to preceed 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 preceeded with 0, 0x or 0X respectively for values different than zero. Used with e, E and f, it forces the written output to contain a decimal point even if no digits would follow. By default, if no digits follow, no decimal point is written. Used with g or G the result is the same as with e or E but trailing zeros are not removed.
0	Left-pads the number with zeroes (0) instead of spaces, where padding is specified (see width sub-specifier).

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 e, E and f specifiers: this is the number of digits to be printed after the decimal point. 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. For c type: it has no effect. When no precision is specified, the default is 1. 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	description
h	The argument is interpreted as a short int or unsigned short int (only applies to integer specifiers: i, d, o, u, x and X).
l	The argument is interpreted as a long int or unsigned long int for integer specifiers (i, d, o, u, x and X), and as a wide character or wide character string for specifiers c and s.
L	The argument is interpreted as a long double (only applies to floating point specifiers: e, E, f, g and G).

additional arguments

Depending on the format string, the function may expect a sequence of additional arguments, each containing one value to be inserted instead of each %-tag specified in the format parameter, if any. There should be the same number of these arguments as the number of %-tags that expect a value.

Return Value

On success, the total number of characters written is returned. This count does not include the additional null-character automatically appended at the end of the string.
On failure, a negative number is returned.

Example

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/* sprintf example */ #include <stdio.h> int main () { char buffer [50]; int n, a=5, b=3; n=sprintf (buffer, "%d plus %d is %d", a, b, a+b); printf ("[%s] is a %d char long string\n",buffer,n); return 0; }

Output:
[5 plus 3 is 8] is a 13 char long string

See also

printf

Print formatted data to stdout (function)

sscanf

Read formatted data from string (function)

http://www.cplusplus.com/reference/clibrary/cstdio/fputs/

fputs

function

<cstdio>

int fputs ( const char * str, FILE * stream );

Write string to stream

Writes the string pointed by str to the stream.
The function begins copying from the address specified (str) until it reaches the terminating null character ('\0'). This final null-character is not copied to the stream.

Parameters

str

An array containing the null-terminated sequence of characters to be written.

stream

Pointer to a FILE object that identifies the stream where the string is to be written.

Return Value

On success, a non-negative value is returned.
On error, the function returns EOF.

Example

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/* fputs example */ #include <stdio.h> int main () { FILE * pFile; char sentence [256]; printf ("Enter sentence to append: "); fgets (sentence,255,stdin); pFile = fopen ("mylog.txt","a"); fputs (sentence,pFile); fclose (pFile); return 0; }

This program allows to append a line to a file called mylog.txt each time it is run.

See also

puts	Write string to stdout (function)

fgets

Get string from stream (function)

fputc

Write character to stream (function)

fprintf

Write formatted output to stream (function)

fwrite

Write block of data to stream (function)