Trace Tables

A trace table shows the value of each variable at each step of an algorithm. The algorithm below calculates monthly simple interest on a principle P over a period of years T. It then calculates a monthly allowance which spend the result over a year.

1 Input P

2 Input R

3 Input T

4 Let I = (P * R * T)/100

5 Let A = P + I

6 Let M = A/(12 * T)

7 Print M

8Stop

The variables are the principal P, the simple interest rate R and the time period T. The trace table shows one column for each variable.