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    <p>You could utilise <code>qsort</code> from <code>stdlib.h</code> to ensure your array is sorted into ascending order to remove the need for a nested loop.</p> <p>Note that qsort requires a pointer to a function (int_cmp in this instance), i've included it below.</p> <p>This function, <code>int_array_unique</code> returns the duplicate free array 'in-place' i.e. it overwrites the original and returns the length of the duplicate free array via the <code>pn</code> pointer</p> <pre><code>/** * Return unique version of int array (duplicates removed) */ int int_array_unique(int *array, size_t *pn) { size_t n = *pn; /* return err code 1 if a zero length array is passed in */ if (n == 0) return 1; int i; /* count the no. of unique array values */ int c=0; /* sort input array so any duplicate values will be positioned next to each * other */ qsort(array, n, sizeof(int), int_cmp); /* size of the unique array is unknown at this point, but the output array * can be no larger than the input array. Note, the correct length of the * data is returned via pn */ int *tmp_array = calloc(n, sizeof(int)); tmp_array[c] = array[0]; c++; for (i=1; i&lt;n; i++) { /* true if consecutive values are not equal */ if ( array[i] != array[i-1]) { tmp_array[c] = array[i]; c++; } } memmove(array, tmp_array, n*sizeof(int)); free(tmp_array); /* set return parameter to length of data (e.g. no. of valid integers not * actual allocated array length) of the uniqe array */ *pn = c; return 0; } /* qsort int comparison function */ int int_cmp(const void *a, const void *b) { const int *ia = (const int *)a; // casting pointer types const int *ib = (const int *)b; /* integer comparison: returns negative if b &gt; a and positive if a &gt; b */ return *ia - *ib; } </code></pre>
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    1. PORemoving Duplicates from an Array using C
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    1. COactually just use Jonathan's answer - its better..
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