C Programming Challenge for Students

What is a pointer in C?

• A pointer is a variable that stores a string in C.

• A pointer is a special kind of loop in C.

• A pointer is a type of function in C.

• A pointer is a variable that holds the address of another variable in C.

How do you declare a pointer variable?

• int *ptr;

• *int ptr;

• pointer int ptr;

• int ptr;

What is the purpose of the 'malloc' function?

• To create a new thread in a program.

• To initialize variables to zero.

• To allocate memory dynamically.

• To free up memory after use.

How do you free dynamically allocated memory?

• Use 'free(pointer)' for malloc/calloc/realloc and 'delete pointer' for new.

• Use 'dispose(pointer)' for malloc/calloc/realloc

• Invoke 'clear(pointer)' to free memory

• Call 'remove(pointer)' for new allocations

What is the difference between 'fopen' and 'fclose'?

• 'fopen' opens a file; 'fclose' closes a file.

• 'fopen' opens a directory; 'fclose' opens a file.

• 'fopen' deletes a file; 'fclose' creates a file.

• 'fopen' reads a file; 'fclose' writes to a file.

How do you read data from a file in C?

• Use read() to directly access the file contents.

• Use file_get_contents() to read the entire file at once.

• Use fopen() to open the file, then read with fscanf() or fgets(), and close with fclose().

• Open the file with open() and read using readlines().

What is a structure in C?

• A structure in C is a way to define constants.

• A structure in C is a function that performs calculations.

• A structure in C is a user-defined data type that groups different data types together.

• A structure in C is a built-in data type for integers.

How do you define a structure in C?

• struct { member1: dataType; member2: dataType; };

• struct StructName { dataType member1; dataType member2; dataType member3; };

• struct StructName { member1, member2; };

• struct StructName { dataType member1; dataType member2; ... };

What is dynamic memory allocation?

• Dynamic memory allocation allows programs to allocate memory during execution, adapting to varying data needs.

• Dynamic memory allocation refers to the fixed allocation of memory for data structures.

• Dynamic memory allocation is the process of allocating memory at compile time.

• Dynamic memory allocation is a method to free up all memory used by a program at once.

How do you allocate memory for an array using 'malloc'?

• int *array = (int *)malloc(n * sizeof(int));

• int array[n];

• int *array = (int *)malloc(sizeof(int));

• int *array = malloc(n);