#include <stdio.h> 
#include <time.h> 

int main() 
{ 
    time_t tim; 
    time_t last; 
    (void)time(&last); 
    (void)time(&tim); 
    for(;;) 
    { 
        (void)time(&tim); 
        if(tim != last) 
        { 
            if((last +1) != tim) 
            { 
                fprintf(stderr,"Time = %08lx\n", tim); 
                fprintf(stderr,"Last = %08lx\n", last); 
            } 
            last = tim; 
        } 
    } 
}