How not to repeat the lottery?

# include & ltstdlib.h & gt

# include & lttime.h & gt

# Define N 50 // Class size

void main()

{

int n；

srand(time(0))； //Obtain the current time as a seed to ensure that the seeds that generate random numbers are different each time.

N = rand()% N；

Printf ("\ n \ nYou are selected: \ n");

printf(" & gt； No. %3d \ n \ n ",n);

System ("suspended");

}