A lottery program written in C

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

 void main()
 {
 int numbers[49];
 int ball, run, i, j, k, flag;
 run = 0;
 ball = 0;
 for(k=1; k<=49; k++)
  numbers[k] = '\0';
 printf("Here are your lottery numbers.\n");
 do
 {
 srand((unsigned)time(NULL));
 ball = rand()%49 + 1;
 flag =0;
 if(ball == numbers[ball])
 {
 flag = 1;
 }
 if(flag==0)
 {
 numbers[ball] = ball;
 run = run + 1;
 printf("%i\n",ball);
 }
 } while(run <= 6);
 }