Programming Languages: C, Java, .NET/WCF & Regex

The regular expression defines three capturing groups for the numbers. The replacement pattern $2/$1/$3 swaps the first group (01) with the second group (02) while leaving the third (03) at the end.

All three patterns match the email. The first matches standard characters before and after the '@' plus a three-letter domain. The second and third allow symbols like dots/dashes and match the domain format correctly.

In regular expressions, \b represents a word boundary - it matches the position between a word character and a non-word character. The caret ^ matches the start of a line, and $ matches the end of a line. Option C has a typo - it should be \b not just b.

WCF (Windows Communication Foundation) services can be hosted in various environments. They can be hosted in Windows services (formerly NT services), IIS (Internet Information Services), WAS (Windows Activation Service), or self-hosted in console applications. The option 'Both 1 and 2' correctly identifies that Windows services and WAS are both valid hosting options for WCF services.

WSHttpBinding in WCF uses SOAP 1.2 protocol, not SOAP 1.1. BasicHttpBinding uses SOAP 1.1. WSHttpBinding is designed for more advanced WS-* standards support and requires SOAP 1.2 for features like WS-Addressing, WS-Security, and reliable messaging. Therefore, the statement is False.

In .NET Framework 3.5, Windows Workflow Foundation (WF) introduced the Receive activity as part of the Workflow Service API. This activity allows workflows to be exposed as WCF services, enabling the workflow to receive and process messages from service clients. The Send activity complements it for sending messages, but Receive is specifically for exposing workflows as services.

WCF defines several contract types that specify different aspects of service communication. Service Contract defines the service operations, Operation Contract marks individual methods, Data Contract defines data structures, Fault Contract handles error information, and Message Contract provides granular control over message format. Method Contract and Data Member Contract are not standard WCF contract types - Data Member is an attribute for Data Contract members, not a contract itself.

Windows Communication Foundation (WCF) includes built-in bindings such as NetMsmqBinding and MsmqIntegrationBinding. These bindings are designed to enable secure and reliable queued communication directly using MSMQ as the underlying transport mechanism, confirming the statement is true.

Due to the short-circuiting behavior of the logical OR (||) operator, the right-hand side i++ && printf(...) is never evaluated because the left operand j (7) is true. As a result, i remains 4, and the expression result of 1 is assigned to j.

The float constant 1.1 undergoes precision loss during conversion when assigned to the single-precision float a. The double b retains full double-precision representation. When compared, a is promoted to double, but because the precision values differ, the equality check fails and prints Hello.

C features block scope rules where variables declared in inner blocks shadow outer declarations. The innermost print statement prints the innermost a (1000), the next outer block prints its local a (100), and the outermost block prints the first a (10), resulting in the output string 100010010.

The for loop has a semicolon immediately after its closing parenthesis, making it an empty loop body. The loop executes from i=0 to i=9, then when i becomes 10, the condition i<10 becomes false and the loop exits. The printf then prints 10, the final value of i.

The statement ++*k increments the value stored at address k (variable i) to 21, leaving the address unchanged at 1000. Next, (*k)++ increments the value of i again to 22 while keeping k pointing to address 1000. Other options incorrectly modify the pointer address.

The line x = x/p causes a compilation error because / is interpreted as the start of a C comment. The compiler looks for a closing */ but never finds one, resulting in a compilation error. To correctly divide x by the value pointed to by p, parentheses are needed: x = x/(*p).

In the C language, compiler specifications do not enforce array boundary checks. Writing to a[7] translates to modifying the memory offset corresponding to that index, and subsequently printing it retrieves the assigned value of 23 without causing a compilation or runtime error.

The code compiles and runs successfully. A Foo object is created, upcast to Object type, then downcast back to Foo. Since the actual object is a Foo instance, the downcast succeeds and foo.i is accessible, printing 'i = 3'. This is a valid casting pattern in Java.

The do-while loop runs while i < 5. In each iteration, i increments (postfix) and j decrements (prefix). After 4 iterations, i becomes 5 (causing loop exit) and j becomes 6. The continue statement has no effect since it's at the end of the loop body.