Thread: how strchr works?

Originally Posted by EVOEx

Well, an array is a pointer (more or less). So actually it says pointer - pointer. Actually, it returns the number of elements from the second address till the first address (exclusive). Basically, it does (address2 - address1) / sizeof(data_type_of_pointer).

The link suggested about pointer arithmetic should contain a more extensive explanation.

thank you very much...i have one more question:

is there another way? i mean insteed "loc-buf" if there is another way that does the same "job".

Although pointers are commonly used in C, you can use an index in a very similar way, to do the same job.

For inexperienced programmers, I believe an index is easier to work with, and to understand:


Say you wanted to find the first 'r':

Code:

int i=0;
char array[] = {"Singing in the Rain"};

while(array[i]) {  //array[string length of array[] + 1 will be '\0'
  if(array[i] == 'r' || array[i] == 'r')
    break;
  ++i;
}

The variable i will now have the element number of the 'R'.

I'm posting this answer code for you with this understanding - you *will* post up code (or pseudo code), to try and solve your future C programming questions, with your first post in a thread. Don't expect a "codez plz" kind of relationship with the forum.

Originally Posted by Adak

Although pointers are commonly used in C, you can use an index in a very similar way, to do the same job.

For inexperienced programmers, I believe an index is easier to work with, and to understand:


Say you wanted to find the first 'r':

Code:

int i=0;
char array[] = {"Singing in the Rain"};

while(array[i]) {  //array[string length of array[] + 1 will be '\0'
  if(array[i] == 'r' || array[i] == 'r')
    break;
  ++i;
}

The variable i will now have the element number of the 'R'.

I'm posting this answer code for you with this understanding - you *will* post up code (or pseudo code), to try and solve your future C programming questions, with your first post in a thread. Don't expect a "codez plz" kind of relationship with the forum.

yeah i know that i have to post code...and this is what i am doing...i just don' t know C very well so i have many troubles...and also, i don' t speek english daily (it is not my "first" language)...this is another problem...but i have to learn C and next year C++ for my university so i just try...thanks for your answer.....

Fixed after I posted Simple function, but it explains how the basic algorithm works.