[Dev-C++] Does the result of my called clock() is wrong?

[<per...@ya...>]

     The below program is just my simple test for clock( ).I use a nesting "for" sentence to consume time.But it seem that the clock( ) doesn't work.The t1 and t2 are all zero.Why the result is in this way?Perhaps my comprehension in clock( ) is wrong.Can anyone give an example about using clock( )?
/* ********************************* */
#include <stdio.h>
#include <time.h>

main()
{
    /*
    time_t biggest = 0x7FFFFFFF;
    printf("biggest = %s \n", ctime(&biggest));
    system("PAUSE");
    */
    int i, j;
    clock_t t1, t2;
    
    
    t1 = clock() / CLOCKS_PER_SEC;
    printf("t1 = %d\n", t1);
    for (i = 0; i < 9999; i++)
        for (j = 0; j < 9999; j++)
            ;
    t2 = clock() / CLOCKS_PER_SEC;
    printf("t2 = %d\n", t2);
    system("PAUSE");    
}  
/* *************************** */
The result is :
t1 = 0
t2 = 0



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