Chapter 5: Program looping Exercise 1: source code from the chapter 5.1 - the eighth triangular number 5.2 - the 200th triangular number, the for loop 5.3 - table of triangular numbers 5.4 - input for triangular number 5.5 - nested for loop 5.6 - the while loop 5.7 - greatest common divisor 5.8 - reversing digits of a number 5.9 - the do-wile loop