Declaration:
char *strtok(char *str1,
const char *str2);
Breaks string str1 into a series of tokens. If
str1
and str2 are not null, then the following search
sequence begins. The first character in str1 that
does not occur in str2 is found. If str1
consists entirely of characters specified in str2,
then no tokens exist and a null pointer is returned. If this
character is found, then this marks the beginning of the
first token. It then begins searching for the next character
after that which is contained in str2. If this
character is not found, then the current token extends to
the end of str1. If the character is found, then it
is overwritten by a null character, which terminates the
current token. The function then saves the following
position internally and returns.
Subsequent calls with a null pointer for str1 will
cause the previous position saved to be restored and begins
searching from that point. Subsequent calls may use a different
value for str2 each time.
Returns a pointer to the first token in str1. If no
token is found then a null pointer is returned.
Example:
#include<string.h>
#include<stdio.h>
int main(void)
{
char search_string[]="Woody Norm Cliff";
char *array[50];
int loop;
array[0]=strtok(search_string," ");
if(array[0]==NULL)
{
printf("No test to search.\n");
exit(0);
}
for(loop=1;loop<50;loop++)
{
array[loop]=strtok(NULL," ");
if(array[loop]==NULL)
break;
}
for(loop=0;loop<50;loop++)
{
if(array[loop]==NULL)
break;
printf("Item #%d is %s.\n",loop,array[loop]);
}
return 0;
}
This program replaces each space into a null character and
stores a pointer to each substring into the array. It then
prints out each item. |
