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    <p>You should just pass pointers (since if you pass arrays to a function, what;'s really passed is a pointer anyway). Also, you can't return an array - again, just return a pointer:</p> <pre><code>int* _addInts(int *x, int *y); // equivalent to: int* _addInts(int x[], int y[]); </code></pre> <p>You'll also have to arrange for the number of elements to be passed in somehow. Something like the following might work for you:</p> <pre><code>int* _addInts(int *x, int *y, size_t count); </code></pre> <p>Also - do <em>not</em> fall into the trap of trying to use <code>sizeof</code> on array parameters, since they're really pointers in C:</p> <pre><code>int* _addInts(int x[], int y[]) { // the following will always print the size of a pointer (probably // 4 or 8): printf( "sizeof x: %u, sizeof y: %u\n", sizeof(x), sizeof(y)); } </code></pre> <p>That's one reason why I'd prefer having the parameters be declared as pointers rather than arrays - because they really will be pointers.</p> <p>See <a href="https://stackoverflow.com/questions/1598773/is-there-a-standard-function-in-c-that-would-return-the-length-of-an-array/1598827#1598827">Is there a standard function in C that would return the length of an array?</a> for a macro that will return the number of elements in an array for actual arrays and will cause a compiler error (on most compilers) much of the time when you try to use it on pointers.</p> <p>If your compiler is GCC, you can use Linux's trick: <a href="https://stackoverflow.com/questions/4415530/equivalents-to-msvcs-countof-in-other-compilers/4415628#4415628">Equivalents to MSVC&#39;s _countof in other compilers?</a></p>
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    1. USMichael Burr
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    1. COThe OP isn't passing arrays to his function. He appears to be trying to pass pointers to arrays, which is probably not what he wants to do, and even if it is, the syntax is wrong. But +1 for solving the problem.
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      1. USChris Lutz
    2. COI'd just like to add that the problem you were encountering is that you were not declaring the arrays correctly. `int[]` is not how arrays are declared in C.
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      1. USmdec
    3. COThanks! About the size - why can't you just call sizeof(x) inside the runtime function?
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      1. USKevin Burke
 

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