C and Java Programming Fundamentals Quiz

In Java, integer division or modulo operations by zero using the / or % operators will throw an ArithmeticException. Floating-point division by zero does not throw an exception but results in Infinity or NaN.

Calling request.getSession(false) retrieves the current active session associated with the request. If no session exists, it returns null instead of creating a new one, which is useful for checking session validity without overhead.

The HttpServletRequest object is passed during a request forward. Attributes stored in the request are shared only with the forwarded resource for that specific request lifecycle, keeping them invisible to other sessions or unrelated servlets.

In OOP terminology, 'object' is a broader concept - anything with identity, state, and behavior (including anonymous or prototype-based objects). 'Instance' specifically means an object created from a class definition using instantiation. An object may not have a formal class (as in prototype-based languages), but an instance must originate from a class.

In Java RMI (Remote Method Invocation), a skeleton is indeed created automatically. The skeleton class runs on the server side and receives remote requests, then marshals the call to the actual remote object implementation. Modern RMI generates skeletons dynamically using reflection, but the concept still exists in the RMI architecture.

This statement is false. JVMTI (JVM Tool Interface) was introduced in JDK 5.0 (1.5) as a replacement for JVMPI (JVM Profiling Interface) and JDWP (Java Debug Wire Protocol). JDK 1.4 did NOT contain JVMTI - it used the older JVMPI profiling interface instead. JVMTI is the profiling/debugging tool in JDK 1.5 and later, not in 1.4.

Protected members are accessible within the same package (to both classes and interfaces) and to subclasses in other packages via inheritance. Option C is wrong because it suggests same-class access isn't required.

In Java, once a thread completes its execution and enters the dead (terminated) state, it cannot be restarted. Attempting to call the start() method again on a dead thread will throw an IllegalThreadStateException.

In most languages (Java, C#, PL/SQL), the default value for a boolean primitive is false. Only uninitialized boolean object references default to null.

EJB components require an EJB container (like JBoss, WebLogic) to run - they're not standalone. JavaBeans are plain Java classes and are portable, but the statement lumps them together incorrectly.

The program declares four integer variables (a=1, b=2, c=3, d=4) and prints them using two printf statements. The first printf outputs a and b, the second outputs c and d with a leading space. The output is 1 2 3 4. Option A and B are incorrect because the code compiles and runs without errors. Option D is incorrect because option C is valid.

The expression uses the comma operator which evaluates left operand and returns right operand. --a is prefix decrement so a becomes 0. b++ is postfix increment so b returns 2 then becomes 3. The comma expression (--a, b++) returns 2. Then c = 2 - 3 = -1. Output: a=0, b=3, c=-1. Option A is wrong (c=-3 incorrect). Option D is wrong (c=0 incorrect).

Evaluate comma expressions left to right, returning rightmost value. (a,a) returns a=1. (b,c) returns c=3. (c,d) returns d=4. (d,b) returns b=2. So e = 1 + 3 + 4 - 2 = 6. Option A is wrong - no compile error. Option B would require different arithmetic. Option D is incorrect.

The format string "%.2" is incomplete - it lacks a type specifier like 'f' for float. In C, this is undefined behavior, but many implementations will simply print the format string literally when it's invalid, resulting in "%.2" as output. This is a common trick question testing knowledge of proper printf format syntax.

The semicolon ';' is a statement terminator in C, not an operator. Having two semicolons 'int b=6;;' is valid - the second semicolon just creates an empty statement. The program correctly computes c = 5 + 6 = 11 and prints it.

The nested loops iterate i from 1-3 and j from 1-2. When i==j (i=1,j=1), continue skips to next j. For i=2, j=2: j%3=2 > 1 is false (2 is not > 1), so no break. printf prints '2'. For i=3, j=1: j%3=1 is not > 1, printf prints '3'. Output: 2,3.

The swap macro expands to multiple statements separated by semicolons, not a single compound statement. Without braces, only 'temp=a' executes conditionally. Since 5 > 6 is false, the entire block is skipped. temp is static and initialized to 0 by default. printf outputs 'a=6 b=0' because 'a=b; b=temp;' execute unconditionally after the if block.

val=5 is unsigned int (typically 16-bit range 0-65535). val-11 = 5-11 = -6, which wraps around to 65530 (65535-6+1). The %u format prints unsigned values, so output is 5 65530. Option A is wrong - no compile error. Option B shows signed behavior which %u won't display.

*&z is a pointer dereference of z's address, which just gives z. *&z *= *&x * *&y becomes z *= x * y, or z = 2 * 4 * 3 = 24. The *& operators cancel out - & takes address, * dereferences it. This is a pointer trick question testing understanding of address and dereference operators.