while(i < 9) {
    a = randomnr(10)+1;
    check = 0;
    for(j = 0; j < 9; j++) {
        if(a == numbers[j]) {
            check = 1;
        }       
    }       
    if(check == 0) { 
        numbers[j] = a;
        i++;    
    }       
}