C Programming Challenge for Kids

What is a pointer in C?

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

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

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

• A pointer is a type of function in C.

How do you declare a pointer variable?

• pointer int ptr;

• int ptr;

• int *ptr;

• *int ptr;

What is the purpose of the 'malloc' function?

• To free up memory after use.

• To initialize variables at compile time.

• To read data from a file.

• To allocate memory dynamically during runtime.

How do you free dynamically allocated memory?

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

• Invoke 'clear(pointer)' to release memory

• Call 'remove(pointer)' for new allocations

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

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

• 'fopen' is used for reading data; 'fclose' is used for writing data.

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

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

• 'fopen' checks if a file exists; 'fclose' renames a file.

How do you read data from a file in C?

• Use getFile() to access the file and print its contents.

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

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

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

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 built-in data type for integers.

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

How do you define a structure in C?

• struct Person { char name; int age[50]; };

• struct { char name[50]; int age; };

• struct Person { int age; char name[50]; };

• struct Person { char name[50]; int age; };

What is dynamic memory allocation?

• Dynamic memory allocation is a technique to store data in a fixed-size array.

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

• Dynamic memory allocation is a method to allocate memory at compile time.

• Dynamic memory allocation is used to free up memory after program execution.

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

• int array[n];

• int *array = malloc(n);

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

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