Programming Fundamentals

Inline functions are expanded at compile time - the compiler replaces the function call with the actual function code, eliminating the overhead of function call mechanism. Virtual functions use dynamic binding, static functions have class scope, and friend functions are non-member functions with special access rights.

A Null pointer is a pointer of any data type that does not point to any valid memory location and generally holds a value of zero. Vptr is a virtual table pointer, Void represents a pointer to an unspecified data type, and Zero is not a standard pointer type.

In C++, if no return type is specified for a function, the default return type is 'int'. This is a legacy feature from C. However, it's considered poor practice - always explicitly specify the return type. The 'void' return type means the function returns nothing, while 'bool' is for boolean return values.

In C#, boxing converts value types to reference types, and unboxing reverses this. During boxing, the runtime creates a temporary reference type object on the heap to hold the value type. Reference types are stored on the heap, not the stack (option A is wrong), and identifiers can contain numeric characters (option D is wrong).

C# allows multiple Main() methods in different classes, but you must specify which one is the entry point using compiler options. The compiler returns an error if multiple Main() methods exist without an explicit entry point specification. Option A is wrong because you CAN define multiple Main() methods.

C# identifiers are names for variables, classes, structs, etc. They must begin with a letter or underscore, are case-sensitive (option B is wrong), and can contain numeric characters after the first character (option D is wrong).

COBOL's PERFORM...UNTIL executes the loop body first, then checks the condition - similar to do-while in Java/C++ (condition checked at bottom, guaranteed at least one iteration). PERFORM...VARYING is more like a for loop.

The PERFORM statement with the AFTER clause in COBOL creates a loop that executes the body first, then checks the condition for subsequent iterations. This is equivalent to a do-while loop in other languages.

When an IF condition evaluates to true, the statements within the THEN branch (the code block associated with the true condition) are executed as part of normal program flow.

WS-N starts at 0, gets set to 5, then PERFORM B-PARA WS-N TIMES executes B-PARA exactly 5 times. The fact that B-PARA changes WS-N to 10 doesn't affect the loop count - PERFORM TIMES evaluates the count once at the start.

To execute programs above the 16 MB line in mainframe systems, you need AMODE=31 (31-bit addressing mode) with RMODE=ANY (allow any residency mode), and avoid SIZE(MAX) compile option. Option A is wrong because AMODE=24 limits to below the line. Option B incorrectly specifies RMODE=31 instead of ANY. Option C is wrong because AMODE=24 is for below-line programs.

In JCL, conditional processing can be achieved through COND parameters on job steps (which execute/conditionally skip steps based on return codes) or IF/THEN/ELSE/ENDIF statements that provide logical control flow within the job. Both mechanisms allow skipping steps based on specified conditions.

The variable ws-var is defined as PIC 9(1), which can only hold single-digit values (0-9). The PERFORM increments ws-var from 1 by 1 until ws-var > 10. When ws-var goes from 9 to 10, the PIC 9(1) truncates 10 to 0, then continues cycling 0-1-2-...-9-0 forever, never reaching >10. This creates an infinite loop.

REFERBACK allows execution of programs from any library by maintaining a reference to the original program location, enabling flexible program execution in mainframe environments. This mechanism provides access to programs across different libraries.