strtok和sscanf

strtok------<string.h>

 

功能：分解字符串为一组标记串。s为要分解的字符串，delim为分隔符字符串。
  
说明：首次调用时，s必须指向要分解的字符串，随后调用要把s设成NULL。
        strtok在s中查找包含在delim中的字符并用NULL('\0')来替换，直到找遍整个字符串。
        返回指向下一个标记串。当没有标记串时则返回空字符NULL。

 

Example

/* STRTOK.C: In this program, a loop uses strtok
* to print all the tokens (separated by commas
* or blanks) in the string named "string".
*/
#include <string.h>
#include <stdio.h>
char string[] = "A string\tof ,,tokens\nand some  more tokens";
char seps[]   = " ,\t\n";
char *token;
void main( void )
{
printf( "%s\n\nTokens:\n", string );
/* Establish string and get the first token: */
token = strtok( string, seps );
while( token != NULL )
{
/* While there are tokens in "string" */
printf( " %s\n", token );
/* Get next token: */
token = strtok( NULL, seps );
}
}

Output

A string   of ,,tokens
and some  more tokens
Tokens:
A
string
of
tokens
and
some
more
tokens

sscanf------------<string.h>

#include <stdio.h>



void main( void )

{

   char  tokenstring[] = "15 12 14...";

   char  s[81];

   char  c;

   int   i;

   float fp;



   /* Input various data from tokenstring: */

   sscanf( tokenstring, "%s", s );

   sscanf( tokenstring, "%c", &c );

   sscanf( tokenstring, "%d", &i );

   sscanf( tokenstring, "%f", &fp );



   /* Output the data read */

   printf( "String    = %s\n", s );

   printf( "Character = %c\n", c );

   printf( "Integer:  = %d\n", i );

   printf( "Real:     = %f\n", fp );

}



Output
String    = 15
Character = 1
Integer:  = 15
Real:     = 15.000000

zjfc-----1024