Batch 2_Updated

What is the primary difference between static keyword used inside a function and outside a function (at file scope)?

• Inside a function, it makes the variable constant; outside, it limits visibility to the current file.

• Inside a function, it preserves the variable's value between calls; outside, it limits visibility to the current file.

• Inside a function, it makes the variable accessible only within the function; outside, it makes the variable global.

• Inside a function, it makes the variable thread-safe; outside, it makes the variable read-only.

Consider this code: int *ptr = malloc(10 * sizeof(int));. What is the most likely problem if malloc fails?

• The program will crash immediately.

• ptr will be a null pointer.

• ptr will point to garbage memory.

• The program will compile with a warning.

What is the correct way to deallocate memory allocated with calloc?

• free(calloc_ptr);

• dealloc(calloc_ptr);

• free(calloc_ptr, size); (where size is the allocated size)

• delete calloc_ptr;

Which of the following is a potential issue with using gets()?

• It's slow.

• It can cause a buffer overflow.

• It can only read strings of a fixed length.

• It's deprecated but still safe to use if you're careful.

What is the output of this code snippet? #include int main() { int arr[] = {1, 2, 3, 4, 5}; int *ptr = arr; printf("%d\n", *(ptr + 2)); return 0; }

• 1

• 2

• 3

• 4

Which of these is NOT a standard C header file?

• stdio.h

• string.h

• iostream.h

• math.h

What does volatile keyword signify in C?

• The variable's value will not be changed.

• The variable might be changed by something outside the program's control.

• The variable will be stored in a register.

• The variable is thread-safe.

What is the size of sizeof(char)?

• 0

• 1

• The size of a pointer

• Depends on the compiler

What is the difference between const char *p and char *const p?

• There is no difference.

• const char *p makes the pointer constant; char *const p makes the string constant.

• const char *p makes the string constant; char *const p makes the pointer constant.

• const char *p is for C++; char *const p is for C.

What is the purpose of a function pointer?

• To store the return value of a function.

• To pass a function as an argument to another function.

• To create a new function dynamically.

• To call a function from a different file.