Tuesday, 20 August 2019
Pre & post increment operator behavior in C, C++, Java, & C#
Answer
Answer
DISCLAIMER: This is not a real-world example. It is just a theoretical question of how these languages work.
What exactly are the differences between C/C++, C#, and Java when it comes to post & pre increment operators?
This is what I get with VC++10, Java 1.6, and C# 4
int a = 2;
int b = a++ + a++;
int c = ++a + a++ + a++;
+-----+------+------+----+
| C | C++ | Java | C# |
+-----+-----+------+------+----+
| a | 7 | 7 | 7 | 7 |
+-----+-----+------+------+----+
| b | 4 | 4 | 5 | 5 |
+-----+-----+------+------+----+
| c | 15 | 15 | 16 | 16 |
+-----+-----+------+------+----+
Answer
Java and C# evaluate expressions from left to right, and the side-effects are visible immediately.
In C++, the order of evaluation of subexpressions is unspecified, and modifying the same object twice without an intervening sequence point is undefined behavior.
Subscribe to:
Post Comments (Atom)
php - file_get_contents shows unexpected output while reading a file
I want to output an inline jpg image as a base64 encoded string, however when I do this : $contents = file_get_contents($filename); print ...
No comments:
Post a Comment