Sessional 2 A3

What will be the output of this code?

int x = 5;

printf("%d %d %d", x++, ++x, x);

• 5 6 6
• 6 6 7
• 5 5 5
• 5 7 7

What will happen if you write the following declaration in C?

const int x = 10;

int *ptr = &x;

*ptr = 20;

printf("%d", x);

• The program will likely print 10, but modifying a const variable through a pointer leads to undefined behavior.
• The program will print 20, as the value of x is changed.
• The program will print an error message at runtime.
• The program will cause a compilation error due to the pointer assignment.

Which of the following is true about variable scope in C?

• C does not support any form of variable scope.
• All variables in C are automatically local to functions.
• Variables in C can have block scope or file scope.
• Variables in C can only have global scope.

How does C interpret the expression int x = (int *) malloc(sizeof(int));?

• The expression is incorrect; it should declare x as a pointer.
• The expression will compile without any errors.
• malloc is not needed for allocating memory in C.
• The expression correctly declares x as an integer.

Which of the following switch cases is invalid?

switch (x) {

case 1.5: printf("Float\n"); break;

case 'a': printf("Char\n"); break;

case 3: printf("Int\n"); break;

}

• case 1.5
• case 4: printf("Float\n"); break;
• case 'b': printf("Char\n"); break;
• case 2.5: printf("Double\n"); break;

Consider this code:

for (int i = 0; i < 5; i++)

{

if (i == 3) break;

}

printf("%d", i);

• 4
• 3
• 2
• 5

What will the output of the following recursive function be?

int func(int n)

{

if (n == 0) return 0; return n + func(n - 1);

}

printf("%d", func(4));

• 10
• 6
• 12
• 8

What does the following function do?

void func(int n) { if (n <= 0) return; func(n / 2); printf("%d ", n); }

• Prints the integers from n to 1 in descending order.
• Prints the integers from 1 to n in ascending order, where n is the input.
• Calculates the sum of integers from 1 to n.
• Prints the binary representation of n.

Consider this function prototype:

int (*func)(int, float);

• A pointer to a function that takes a float and returns an int.
• A pointer to a function that takes two integers and returns a float.
• A pointer to a function that takes an int and returns a void.
• A pointer to a function that takes an int and a float and returns an int.

Consider this function prototype:

int (*func)(int, float);

• func is a pointer to a function that takes an int and a float as parameters and returns an int.
• func is a pointer to a function that takes an int and returns a float.
• func is a pointer to a function that takes a float and a double as parameters and returns a void.
• func is a pointer to a function that takes two integers as parameters and returns a float.