I want to check duplicate values in an array

Question

Hi i\'m really glad to know this site to ask question. I have a problem that i made an array. And then i want to check matching values in the array. For example,

Answer 1

How do you use the "qsort"?

qsort(( void * )array, 5 , sizeof( data[0] ) , my_sort );

my_sort is a function to create your own. For example,

int my_sort( const void * a , const void * b ) {
    if( *( int * )a < *( int * )b ) {
        return -1;
    }
    else
    if( *( int * )a == *( int * )b ) {
        // You can check here.

        return 0;
    }
    return 1;
}