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When multiple formulas are needed to calculate a solution, the program can take two forms. For example, the two forms of the program shown below are equivalent. However, the one on the right is a better description of the actions required to solve the problem.
percent = ((total-portion wrong)/total)X100; portion right = total-portion wrong;
percent = (portion right/total)X100;
The order of the statements is important. They must be calculated
in the order specified. Thus portion right = total - portion wrong; and percent = (portion right/total)X100; percent = (portion right/total) X 100; right = total - portion wrong;are NOT equivalent. Given a table similar to the quiz problem, the sequence on the left produces
-------------------------------
|total|portion|portion|percent|
| |wrong |right | |
-------------------------------
| 35 | 7 | 28 | |
-------------------------------
and then -------------------------------
|total|portion|portion|percent|
| |wrong |right | |
-------------------------------
| 35 | 7 | 28 | 80 |
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However, the sequence on the right would attempt to perform the division
"portion right/total" before the portion right had been calculated producing an error.