This is for python defining. I cant find the answers in the book:

This loop structure can be used when the number of iterations is known or can be calculated called

This loop can be used whenever we need the user to explicitly indicate when the loop should continue called

This loop can be used when the program expects a stream of values, and one these values signals the end of the loop called

This loop structure can be used in any situation a loop is needed called

Why this program isnt running and if it is what does it print out?

import random

rolls =0 total =0 while total !=21: die1 = randint(1,6) die2 = randint(1,6) total += die1+die2 rolls +=1 print("Whats up", rolls)