sprintf, swprintf
Write formatted data to a string.
**intsprintf(char*buffer,constchar*format [,**argument] ... );
**intswprintf(wchar_t*buffer,constwchar_t*format [,**argument] ... );
| Routine | Required Header | Compatibility |
| sprintf | <stdio.h> | ANSI, Win 95, Win NT |
| swprintf | <stdio.h> or <wchar.h> | ANSI, Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
sprintf returns the number of bytes stored in buffer, not counting the terminating null character. swprintf returns the number of wide characters stored in buffer, not counting the terminating null wide character.
Parameters
buffer
Storage location for output
format
Format-control string
argument
Optional arguments
For more information, see Format Specifications.
Remarks
The sprintf function formats and stores a series of characters and values in buffer. Each argument (if any) is converted and output according to the corresponding format specification in format. The format consists of ordinary characters and has the same form and function as the format argument for printf. A null character is appended after the last character written. If copying occurs between strings that overlap, the behavior is undefined.
swprintf is a wide-character version of sprintf; the pointer arguments to swprintf are wide-character strings. Detection of encoding errors in swprintf may differ from that in sprintf. swprintf and fwprintf behave identically except that swprintf writes output to a string rather than to a destination of type FILE.
Generic-Text Routine Mappings
| TCHAR.H Routine | _UNICODE & _MBCS Not Defined | _MBCS Defined | _UNICODE Defined |
| _stprintf | sprintf | sprintf | swprintf |
Example
/* SPRINTF.C: This program uses sprintf to format various
* data and place them in the string named buffer.
*/
#include <stdio.h>
void main( void )
{
char buffer[200], s[] = "computer", c = 'l';
int i = 35, j;
float fp = 1.7320534f;
/* Format and print various data: */
j = sprintf( buffer, "\tString: %s\n", s );
j += sprintf( buffer + j, "\tCharacter: %c\n", c );
j += sprintf( buffer + j, "\tInteger: %d\n", i );
j += sprintf( buffer + j, "\tReal: %f\n", fp );
printf( "Output:\n%s\ncharacter count = %d\n", buffer, j );
}
Output
Output:
String: computer
Character: l
Integer: 35
Real: 1.732053
character count = 71
See Also _snprintf, fprintf, printf, scanf, sscanf, vprintf Functions