Which type of loop is best if you do not know how many times you need the loop to run?

While:  the loop must repeat until a certain "condition" is met.  If the "condition" is FALSE at the beginning of the loop, the loop is never executed.  The "condition" may be determined by the user at the keyboard.  The "condition" may be a numeric or an alphanumeric entry.  This is a good, solid looping process with applications to numerous situations. 
while:int ctr = 1;
while (ctr < = 20)
{
     cout<< ctr++ <<"\n";
}



HOPE i HELPED! brainliest? :D 

What's the rest of it? lol