Initially, a[1] is 1. The line i = ++a[1] increments a[1] to 2 and sets i to 2. Then j = a[1]++ sets j to 2 and increments a[1] to 3. Finally, m = a[i++] assigns a[2] (which is 15) to m and increments i to 3, resulting in 3 2 15.

The standard modulo operator (%) in C only works with integer types. To find the remainder of a division involving floating-point numbers like 5.5 and 1.3, the fmod function from the math.h library must be used.

Recursive functions are capable of returning values, such as the result of a factorial or Fibonacci calculation. The other statements are true: they call themselves, require a termination condition to avoid infinite loops, and can be logically replaced by iterative loops.

The switch statement in C requires the controlling expression to be of an integral type, such as int, char, or an enumeration. Floating-point values are not allowed because they cannot be reliably checked for exact equality due to precision issues.

The malloc function returns a void pointer (void*) to the start of the allocated memory block, or NULL if the allocation fails. It does not return the number of bytes allocated, nor does it automatically return a specific type like a float pointer.

DIM1 is a macro that calculates the array size correctly (10) because the array name in that scope represents the whole array. In DIM2, the array decays into a pointer when passed as an argument, so sizeof(array) returns the size of a pointer, resulting in 1.

Malloc, calloc, and realloc are all functions used to request and allocate memory on the heap. Free is the odd one out because its function is to release or deallocate memory that was previously allocated.

In many C compilers, printf arguments are evaluated from right to left. Starting from the right, ++j makes j=3, then j is 3, then i++ returns 2 (and i becomes 3), and finally i is 3, resulting in the output 3 2 3 3.

The extern keyword tells the compiler that the variable 'out' is defined elsewhere. Even though the actual definition of 'out' appears after the main function, the linker will correctly resolve the reference to the global variable and print 100.

Local variables are stored on the stack, while global and static variables are stored in the data segment of main memory. Register variables are stored in CPU registers for faster access, matching the pairs 1-a, 2-d, 3-b, and 4-c.

The goto statement in C is restricted to jumping within the same function. Because the label 'here' is defined in fun() and the goto statement is in main(), the code will fail to compile.

The expression *a + 1 - *a + 3 simplifies mathematically because the terms *a and -*a cancel each other out. This leaves 1 + 3, which results in 4, regardless of the values stored in the array.

The string 'Angel' is stored with a null terminator at index 5. Modifying the character at index 6 does not affect the null terminator at index 5, so printf stops at the end of 'Angel'.

Command line arguments are always passed to the main function as an array of strings, even if they represent numeric values. Statement I is false because arguments are runtime inputs, and statement III is false because the first argument is the program name.

The scanf function returns the number of items successfully read and assigned. Since one integer is successfully scanned into variable i, scanf returns 1, which is then printed by the outer printf.

In a 16-bit system, -1 is represented as 0xFFFF in two's complement. Shifting this value left by 4 bits results in 0xFFF0, which is printed as fff0 by the %x format specifier.

A structure allocates separate memory for every member, whereas a union shares the same memory space for all members. Consequently, a structure's size is the sum of its members (plus padding), while a union's size is only that of its largest member.

The expression sizeof(*p) gives the size of a char (1 byte), while sizeof(p) gives the size of the pointer itself. In many 16-bit environments, pointers are 2 bytes, leading to the output 1 2.

The static variable 'var' is initialized once and retains its value across recursive calls. Each call to main prints the current value and decrements it, continuing until 'var' reaches 0, resulting in the sequence 5 4 3 2 1.

The preprocessor replaces the keyword 'int' with 'char' throughout the code. Thus, the variable 'i' is actually a char, and sizeof(i) returns 1, the size of a character in C.

In C, you cannot initialize members inside a structure definition, nor can you declare an array without a size inside a structure unless it is a flexible array member. These syntax violations cause a compilation error.

The comma operator evaluates operands from left to right. While the C standard does not define the evaluation order of function arguments, many compilers evaluate printf arguments from right to left to handle variable argument lists.

The code skips the first block because NULL is 0 (false). It enters the 'else if' block because FALSE is defined as -1, which is non-zero and thus true in C, resulting in the output 'TRUE'.

The array 'arr' is declared as const, meaning its contents are read-only. Passing the address of a const element to a function that attempts to modify it through a non-const pointer is a violation that results in a compiler error.