I need help on a c program that randomly generates a 7 digit

I need help on a c++ program that randomly generates a 7 digit login. It does the same thing after a certain time period has gone past (i.e after 30 seconds it runs through the loop again)

Solution

#include<iostream>
#include<ctime>
int main()
{
int n;
int i=1;
clock_t start,end;
srand(time(NULL));
while(i<=30)
{
start=clock();
n=rand()%1000000+1;
cout<<\"login:\"<<n;
abc:
end=clock();
if(!((end-start)*1000>=30.0))
goto abc;
i++;
}
return 0;
}