Hi there,
Im trying to find the right way to code the loop to count the number of
occurences of a given substring in a string. Im able to find the first
occurence using the strstr function, but I just cant seem to think of
the right loop that would continue searching after finding this first
occurence. Could someone please help me out here? 4 14128 si*********@gma il.com wrote: Hi there,
Im trying to find the right way to code the loop to count the number of occurences of a given substring in a string. Im able to find the first occurence using the strstr function, but I just cant seem to think of the right loop that would continue searching after finding this first occurence. Could someone please help me out here?
I think this is OK:
int
count_strinstr( const char *big, const char *little)
{
const char *p;
int count = 0;
size_t lil_len = strlen(little);
/* you decide what to do here */
if (lil_len == 0) return -1;
p = strstr(big, little);
while (p) {
count++;
p = strstr(p + lil_len, little);
}
return count;
}
If either arg is NULL this will probably barf.
-Charlie
"Charles Mills" <cm****@freeshe ll.org> wrote in message
news:11******** **************@ g14g2000cwa.goo glegroups.com.. . si*********@gma il.com wrote: Hi there,
Im trying to find the right way to code the loop to count the number of occurences of a given substring in a string. Im able to find the first occurence using the strstr function, but I just cant seem to think of the right loop that would continue searching after finding this first occurence. Could someone please help me out here?
I think this is OK:
int count_strinstr( const char *big, const char *little) { const char *p; int count = 0; size_t lil_len = strlen(little);
/* you decide what to do here */ if (lil_len == 0) return -1;
p = strstr(big, little); while (p) { count++; p = strstr(p + lil_len, little); } return count; }
If either arg is NULL this will probably barf.
-Charlie
It depends on whether the occurrences have to be distinctly separate from
one another.
Consider:
little is "abab"
big is "ababababababab "
Barry
Hey Charlie,
"p = strstr(p + lil_len, little);"
That addition of the string length was the logic that I was lookin for.
Thanks a lot for your help. Appreciate it.
<si*********@gm ail.com> wrote "p = strstr(p + lil_len, little);"
That addition of the string length was the logic that I was lookin for. Thanks a lot for your help. Appreciate it.
If you want to allow sustrings to overlap, add one to the pointer. If you
want to disallow this, add the length of the substring, as Charles showed
you. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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