19-True or False: The while loop is a pretest loop.

20- True or False: The do-while loop is a pretest loop.

21-True or False: The for loop is a posttest loop.

22- True or False: It is not necessary to initialize accumulator variables.

23- True or False: One limitation of the for loop is that only one variable may be initial- ized in the initialization expression.

24-True or False: A variable may be defined in the initialization expression of the for loop.

25-True or False: In a nested loop, the inner loop goes through all of its iterations for every iteration of the outer loop.

26- True or False: To calculate the total number of iterations of a nested loop, add the number of iterations of all the loops.