A flow chart presents a series of instruction s to implement an algorithm in graphical form. A flow chart contains three types of boxes:
The boxes are connected with arrows to point the way through the flowchart. Decision boxes may ask a question, which require a yes or no answer. One of the answers may lead to an earlier part of the table, and in this way certain instructions may be repeatedly carried out – this is a loop. A flowchart can be accompanied by a trace table which shows the results of each step. The following flow chart finds all the factors of a number.
| | | Output | |
| 1 | 10 | 1 | No |
| 2 | 5 | 2 | No |
| 3 | 10/3 | | No |
| 4 | 5/2 | | No |
| 5 | 2 | 5 | No |
| 6 | 5/3 | | No |
| 7 | 10/7 | | No |
| 8 | 5/4 | | No |
| 9 | 10/9 | | No |
| 10 | 1 | 1 | Yes |
