C Language Practice Test - 1

C language Practice Tests

Which operator is used to perform a bitwise XOR operation in C?

C language Practice Tests

When should the volatile qualifier be used for a variable?

When the variable's value can change outside the program flow, such as in hardware registers

When you need to optimize variable access speed

When you want the variable to be shared among different threads

When you need to ensure the variable is not modified

C language Practice Tests

Which keyword prevents a function from being inlined by the compiler?

inline

noinline

static

extern

C language Practice Tests

What is the purpose of setjmp() in C?

It saves the execution state for later restoration using longjmp()

It sets the program counter to a specific address

It initializes a new execution environment

It jumps to a different code segment

C language Practice Tests

Which function is used to adjust the size of a previously allocated memory block?

malloc()

calloc()

free()

realloc()

C language Practice Tests

What does the sizeof operator return for an int on a 64-bit system?

2 bytes

4 bytes

8 bytes

Depends on the compiler and platform

C language Practice Tests

How can you declare an array whose size is determined at runtime?

int arr[10];

int arr[] = {1, 2, 3};

int arr[n];

int *arr;

C language Practice Tests

How do you compile a C source file into a shared library?

gcc -shared -o library.so source.c

gcc -static -o library source.c

gcc -o library.so source.c

gcc -lib -o library source.c

C language Practice Tests

Which syntax is correct for declaring a pointer to a function that returns an int?

int (*func_ptr)();

int func_ptr*();

int func_ptr();

int *func_ptr();

10.

C language Practice Tests

What effect does the static keyword have on a variable within a function?

The variable retains its value across function calls

The variable is only accessible within the file

The variable is initialized to zero automatically

The variable's value cannot be changed after initialization