Array

random=myrandom(n);
list[0]=random; /* initialized list[]*/
for(i=1;i<=n;i++)
 {random=myrandom(n);
     for(j=0;j<=i,j++) /* checking earlier elements*/
.......
.......(/* all I tried below to see if all elements ar different that what I need to add 
does not work*/)
........
........
     if(list[j]!=random)
     random=myrandom(n);
  }

#define NUM_RANDOMS 10
int random = 0;
bool found = false;
int list[NUM_RANDOMS];
for (int i = 0; i < NUM_RANDOMS; ++i)
{
	 random = myrandom(n); //I'm assuming n is a seed 
declared somewhere else in your code
         found = false; //reset
	 for (int j = 0; j < i; ++j) //iterate thru the list up to now
	 {
		  if (list[j] == random) //if we find the current random number, set the variable found to true and stop iterating
		 {
				found = true;
				break;
		  }
	 }
	 if (!found) list[i] = random; //if it wasn't found, we can add the current random number to the list
}

//After initializing list[]

//Assume that user is asked everytime to insert an elelment.

char reply;
reply = 'Y' ; //standing for yes and 'N' for No.
int j = 0, random = 0;
while( reply != 'N')
{
   random = myrandom; 
   j = 0;
   while( j != Length(list[]) ) 
      if( list[j] == random ) 
          break ; 
      else
            j++; 
     
   if( j == Length ( list [] )   
      list[++j] == random; 
   else 
   { 
     cout<<"Continue? " ; 
     cin >> reply; 
   }

}