Possible Duplicate:
How to compare pointer to strings in C
How to compare the characters in a buffer with a string?
-
Can you explain your problem clearly?sunmoon– sunmoon2011-02-22 06:03:46 +00:00Commented Feb 22, 2011 at 6:03
-
1If possible, give an example.sunmoon– sunmoon2011-02-22 06:04:06 +00:00Commented Feb 22, 2011 at 6:04
-
i tried comparing the contents of a buffer with a string. like strcmp(buffer,"change")neha– neha2011-02-22 06:19:30 +00:00Commented Feb 22, 2011 at 6:19
Add a comment
|
4 Answers
By buffer, I assume its not NULL terminated. Then you can not use strcmp, instead you can use strncmp.
2 Comments
neha
it is specifying as too few arguments: strncmp(buffer,"change")
Asha
@neha: It takes 3 arguments (see link). Third argument is the number of characters in the buffer. Note that it matches substring. If you want the exact match then you need to compare the string length with number of characters in the buffer.
Assuming, the buffer is an array of characters. You can compare character by character. Example -
char buffer[] = { 'a','b','c' };
char* str = "b";
int i=0;
while( i<3 )
{
if( buffer[i] == *str )
printf("\n Equal \n" );
else
printf("\n Not Equal \n" );
++i;
}
The above code should give you basic idea of how to implement. Results : IdeOne
Things you need to think of to answer the question -
- What if the value pointed by
stris"abc"? - What if the entire buffer needs to be compared to value pointed by
char*( i.e., buffer is equal to value pointed bychar*?
Comments
Something that throws a lot of people off at first is that strcmp returns 0 if the strings match, so you usually use something like if (!strcmp(buffer, "change"))
Comments
int strcmp ( const char *s1, const char *s2 );
Try this. It will help you.
1 Comment
neha
i tried strcmp(buffer, "change").