How do I find the length number of items present for an array

Question

Possible Duplicate    length of array in function argument       My array size is 5  For example   arrCustId 5    How can I know how many Customer IDs are already present in my array  In short how to find length of array

User · Answer

I m not sure that i know exactly what you mean   But to get the length of an initialized array   doesn t strlen string  work

User · Answer

If the array is statically allocated  use sizeof array    sizeof array 0    If it s dynamically allocated  though  unfortunately you re out of luck as this trick will always return sizeof pointer type  sizeof array 0    which will be 4 on a 32 bit system with char s  You could either a  keep a  define  or const  constant  or b  keep a variable  however

User · Answer

Do you mean how long is the array itself  or how many customerids are in it   Because the answer to the first question is easy  5  or if you don t want to hard-code it  Ben Stott s answer    But the answer to the other question cannot be automatically determined  Presumably you have allocated an array of length 5  but will initially have 0 customer IDs in there  and will put them in one at a time  and your question is   how many customer IDs have I put into the array    C can t tell you this  You will need to keep a separate variable  int numCustIds  for example   Every time you put a customer ID into the array  increment that variable  Then you can tell how many you have put in

[c] How do I find the length/number of items present for an array?

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