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    <p>When you free a pointer, what happens to the memory allocated to it is undefined. It will not be cleared, it might be re-used and the content of the memory might be overwritten... or maybe not.</p> <p>In your case, it seems that the memory stayed untouched between the moment you freed it and the moment you print it, but this might not be the case at every execution of your program or on every operating system.</p> <p><code>void* realloc (void* ptr, size_t size)</code> will copy the memory allocated at <code>ptr</code>, and copy it the a new memory region of size <code>size</code>. But what do you ant to achieve with <code>realloc</code>?</p> <blockquote> <p>Is there any easier way to do all this in separate functions? can you be more specific on this ?</p> </blockquote> <p>UPDATE (on comment) : you can refactor your two functions to have the same type of interface but to be usable in different contexts with the following prototypes : </p> <pre><code>// the functions take as a parameter an array of integers, an a pointer to an integer. It returns an array of transformed data and through the second parameter, the length of the output. int* findDividers(int input, int* output_length) { int* dividers = malloc(input * sizeof(int)); int found_dividers = 0; // do things int* tmp = realloc(dividers, found_dividers); free(dividers); *output_length = found_dividers; return tmp; } int* primeFilter(int* input, int input_length, int* output_length) { /* same structure as before */ } // you can then use it as follow int integer_to_process = 0xdeadbeef; int dividers_count = 0; int* dividers = findDividers(integer_to_process, &amp;dividers_count); int primes_count = 0; int* primes = primeFilter(dividers, dividers_count, &amp;prime_count); // now feel free to use the two arrays, with a minimal length, as you want. </code></pre>
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    1. PO"Dynamic (pointer) arrays" across functions
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    1. COI want to use realloc() to add one more "length" to the *divResult so I won't have to allocate a*sizeof(int) (which in this case, is unnecessary much memory allocation) Also I want the division() function and the primes() function to be separate functions. I have seen cases where the division() and primes() are put in one function, which is not what I want.
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    2. COthanks for the detailed information
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