Exercises 10.10 Drill and Practice

Write code that calculates and prints the first 5 triangular numbers. It should produce the following output:

1       1
2       3
3       6
4       10
5       15

(hint: use a web search to find out what a triangular number is.)

Write a program that initializes a list with a set of predefined elements and then prints each element of the list on a new line.

Write a program that prompts the user to enter a line of text and then prints each character of the text on a new line.

Write a program that repeatedly prompts the user to enter a word and checks whether the word starts with a vowel (a, e, i, o, u). The program should display a message indicating whether the word starts with a vowel or not. The user can exit the program by entering a minus sign ("-").

Below is a for loop that works. Underneath the for loop, rewrite the problem so that it does the same thing, but using a while loop instead of a for loop. Assign the accumulated total in the while loop code to the variable sum2. Once complete, sum2 should equal sum1.