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

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.

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

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

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

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