content of a specific location in a string

[hadeelqasaimeh]

hi all
i need to know a content of a specific location in some string i have recieved from rs-232 port.
for example i need to know whats in S[10] in location 10,,so how to do?

thanx

[Ttelmah]

In C, there is a 'cross correlation', between what are called 'pointers', and 'arrays'. If (for instance), you have:

char str[20];

//and then call:

gets(str);

//which sends the 'pointer' to 'str', to the function, then after the data is retrieved:

str[0] will contain the first character received.

So, 'strings', are just arrays of characters (with a '0' in the last location used), and can be accessed either way at will. Using the 'pointer' notation:

*(str+10)

will be the 'contents' of the _eleventh_ character in the string. Remember that throughout C, things arrays, pointers etc., are 'zero referenced', so a ten element string (str[10]), has elements str[0] to str[9]. Also that for a string, there must be a terminating '0', so only nine useable characters can actually be held in such a ten element array.
Forgetting that you need this 'extra' character, and the use of the zero location, are the two commonest problems with strings in C.

Best Wishes

[garage]

please if you have a simple example code of this!!
thank you

[hadeelqasaimeh]

thanx

[Mark]

[hadeelqasaimeh]

hi
i understand that

[asmallri]

assuming the following:

[Mark]