C Programming - MCQ Practice Questions

Which of the following will correctly compare two strings?

What is the correct syntax to concatenate two strings safely in modern C?

What does the following code do? char str[] = "HELLO"; for(int i = 0; str[i]; i++) str[i] = str[i] + 32;

Consider: char str[10]; strcpy(str, "Hello"); What is the state of memory after this?

What does strtok(str, delim) return on each call until the string ends?

What is the correct way to declare a pointer to a character array?

What happens when you try to modify a string literal in C? char *str = "Hello"; str[0] = 'J';

Which of the following correctly reverses a string in-place?

What is the output of the following code? char str[] = "GATE"; printf("%d", sizeof(str));

Consider: int arr[10]; int *ptr = arr; What does ptr[5] represent?

What will be printed? char str[] = "Hello"; printf("%c", *(str+2));

What is the difference between arr[5] and *arr when arr is an array?

Which statement about 2D arrays in C is correct?

What is the output? char str[6] = {'H','e','l','l','o'}; printf("%s", str);

Consider a 3D array: int arr[2][3][4]. How many elements total?

What will be the result of accessing arr[10] when arr is declared as int arr[5]?

What is the difference between char str[20] and char *str in C?

What does strcpy(dest, src) do, and what is its main risk?

In a string comparison, strcmp('Apple', 'apple') returns:

What is the memory layout of a 2D array int arr[3][4] in C?