i’ve managed to completely it but there’s a small problem: it still prints 9 and 15 as prime even though i’ve got the largest factor. how should i change the code?

```
int num=2,temp=0;
do{
for(int i=(num-1);i>=2;i--){
if(num%i==0){
System.out.println(num+" largest factor is "+i);
break;
}
}
boolean prime=false;
for(int j = 2; j < num; j++){
if(num % j == 0){
break;
}
else{
prime=true;
}
}
if(prime == true){
System.out.println(num+" is prime");
}
num++;
}while(num<21);
```