KwickClips Java · 39 sec · free
What does b = a++ store when a is 5?
Short answer. 5, the old value. Then a becomes 6.
Which form changes the value first?
Prefix, ++a.
a starts at 5
| Line | a | b |
|---|---|---|
| b = ++a; | 6 | 6 |
| b = a++; | 6 | 5 |
Remember
| ++a: change, then use |
| a++: use, then change |
One small change, and b gets a different value. Watch. Prefix changes first, so b gets six. Postfix uses the old value, so b gets five. Prefix changes, then uses. Postfix uses, then changes.
This clip is from the full lesson: Unary, Compound Assignment and Ternary Operators — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications
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