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.
Line | P | R | T | I | A | M |
1 | 500 | |||||
2 | 500 | 6 | ||||
3 | 500 | 6 | 4 | |||
4 | 500 | 6 | 4 | 120 | ||
5 | 500 | 6 | 4 | 120 | 620 | |
6 | 500 | 6 | 4 | 120 | 620 | 51.67 |
7 | 500 | 6 | 4 | 120 | 620 | 51.67 |
8 | 500 | 6 | 4 | 120 | 620 | 51.67 |