Tricky basic java operations
The major difference here is what
pre increment are. These determine whether the value is increased before evaluation, or afterward.
Here is how the first case breaks down mathematically:
a = 5 - (4 + 6), which reduces to
a is increased from
preincrement before the math is done, however
b is calculated as
4. Another thing to note is the
a used from the
-= uses the original
a value, regardless of post or pre increment.
The second equation reduces to this mathematically:
c = 8 + 9 which reduces to
The output prints
18 because your
System.out.print(++c) increments it one more time before output due it being preincrement. Note if the
c++, the value would print to
The chart for operator precedence can be found here. Note that assignment has lower precedence than the unary/postfix operators.
10 Tricky Core Java Interview Coding Questions, Java tricky interview questions, java interview coding questions, java tricky programs, tricky core java interview questions, tricky java coding questions. And for post-operations — or ++ result executed immediately after The Bitwise Operators Java defines several bitwise operators, which can be applied to the integer types, long, int, short, char, and byte. Bitwise operator works on bits and performs bit-by-bit operation. Assume if a = 60 and b = 13; now in binary format they will be as follows −
It's all about the Operator Precedence in Java. Check that table and figure out which operation takes place first and which last.
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It is equivalent to:
int a = 5; int b = 4; a -= (b++) + ++a; // => 5 -= (4) + 6 int c = 8; c += ++c; // => 9 += 9
The main diff is thet:
++a and ++c increments the value and immediately returns it.
b++ returns the value and then increments it.
Java Tricky Output Questions, Answer: b) Something else (Other than simple concatenation) Reason: “java” would be printed if String literals (in double quotes) are used, but in the question Basics: arguments is a local variable, available inside all functions that provides a collection of all the arguments passed to the function. arguments is not an array rather an array like object. It has length but doesn't have the methods like forEach, indexOf, etc.
There is a difference in the order of ++. While both increase the variable, ++a will pass the original value to the operation chain your in middle of; while a++ would pass the new value. So for your first example:
++a --> a is now 6; but the equation is using 5: a -= (b++) + 5; b++ --> b is now 5; a -= 5 + 5; a -= 10; ? = 5 - 10; a = a - 5 + 5; a = 5 - 5 + 5; a = -10;
(You should have enough to trace the second example).
For a list of operations try this. Some more increment examples are here.
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A minimal example is `
int x=3,y=3; x += ++x; y+= y++;
at the x x is 7 and y is 6. Precedence alone is not enough to explain the behaviour. Using precedence the second line would be
x += (++x), i.e. increment x and return its value, (x is now 4); next we have
x+=4 which would return 8.
Instead, it seems better to treat
x += w as a short hand for
x = x + w, this rewriting happens before evaluation. In our case the rewriting is
x = x + ++x interpreted as
x = (x + (++x)). So interpreted as
x = ( 3 + (++x)) x = ( 3 + 4 ) x is 4 x = 7 x is 7
A simlar system works to the y equation giving y = 6 at the end.
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Questions and Exercises: Operators (The Java™ Tutorials , The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later The best way we learn anything is by practice and exercise questions. Here you have the opportunity to practice the Java programming language concepts by solving the exercises starting from basic to more complex exercises. It is recommended to do these exercises by yourself first before checking the solution.
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Java Tricky Interview Questions, Java Tricky Interview Questions. Core Java tricky programming interview questions with answers. java code snippet interview questions, programs code. The unsigned right shift operator " >>> " shifts a zero into the leftmost position, while the leftmost position after ">>" depends on sign extension. The bitwise & operator performs a bitwise AND operation. The bitwise ^ operator performs a bitwise exclusive OR operation.