C语言求教
谁能帮我解释下whlie（scanf("%f,%f",&a,&b)==2)
这是什么意思啊，等2代表输入值正确吗，那为什么不用1呢，看不懂
望高人指点
[解决办法]
查MSDN是Windows程序员必须掌握的技能之一。
scanf, wscanf
Read formatted data from the standard input stream.
int scanf( const char *format [,argument]... );
int wscanf( const wchar_t *format [,argument]... );
Routine Required Header Compatibility
scanf <stdio.h> ANSI, Win 95, Win NT
wscanf <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
Both scanf and wscanf return the number of fields successfully converted and assigned; the return value does not include fields that were read but not assigned. A return value of 0 indicates that no fields were assigned. The return value is EOF for an error or if the end-of-file character or the end-of-string character is encountered in the first attempt to read a character.
Parameters
format
Format control string
argument
Optional arguments
Remarks
The scanf function reads data from the standard input stream stdin and writes the data into the location given by argument. Each argument must be a pointer to a variable of a type that corresponds to a type specifier in format. If copying takes place between strings that overlap, the behavior is undefined.
wscanf is a wide-character version of scanf; the format argument to wscanf is a wide-character string. wscanf and scanf behave identically otherwise.
Generic-Text Routine Mappings
TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_tscanf scanf scanf wscanf
For more information, see Format Specification Fields — scanf functions and wscanf Functions.
Example
/* SCANF.C: This program uses the scanf and wscanf functions
* to read formatted input.
*/
#include <stdio.h>
void main( void )
{
int i, result;
float fp;
char c, s[81];
wchar_t wc, ws[81];
printf( "\n\nEnter an int, a float, two chars and two strings\n");
result = scanf( "%d %f %c %C %s %S", &i, &fp, &c, &wc, s, ws );
printf( "\nThe number of fields input is %d\n", result );
printf( "The contents are: %d %f %c %C %s %S\n", i, fp, c, wc, s, ws);
wprintf( L"\n\nEnter an int, a float, two chars and two strings\n");
result = wscanf( L"%d %f %hc %lc %S %ls", &i, &fp, &c, &wc, s, ws );
wprintf( L"\nThe number of fields input is %d\n", result );
wprintf( L"The contents are: %d %f %C %c %hs %s\n", i, fp, c, wc, s, ws);
}
Output
Enter an int, a float, two chars and two strings
71
98.6
h
z
Byte characters
The number of fields input is 6
The contents are: 71 98.599998 h z Byte characters
Enter an int, a float, two chars and two strings
36
92.3
y
n
Wide characters
The number of fields input is 6
The contents are: 456 92.300003 y n Wide characters
Floating-Point Support Routines, Stream I/O Routines, Locale Routines
See Also fscanf, printf, sprintf, sscanf
