Lecture 89:- Let's Practice Pointers

Sure! Let's practice some pointer exercises in C. I'll provide you with a few tasks to work on. Remember to understand the concepts and double-check your code for correctness and memory safety.

Exercise 1: Write a C function that swaps the values of two integers using pointers. The function should have the following prototype:

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void swap(int *a, int *b);

Exercise 2: Write a C function that takes an array of integers and its size as input and returns the sum and average of the elements in the array using pointers. The function should have the following prototype:

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void sum_and_average(int arr[], int size, int *sum, float *average);

Exercise 3: Write a C function that reverses an array of integers in-place using pointers. The function should have the following prototype:

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void reverse_array(int arr[], int size);

Exercise 4: Write a C function that takes two strings as input and checks if the second string is a substring of the first string using pointers. The function should return 1 if the substring is found; otherwise, it should return 0. The function should have the following prototype:

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int is_substring(const char *str, const char *substring);

Exercise 5: Write a C function that takes an array of integers and its size as input and dynamically allocates memory for a new array that contains only the even elements from the original array. The function should return a pointer to the new array. Remember to free the dynamically allocated memory when it's no longer needed.

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int* get_even_elements(const int arr[], int size);

Feel free to try solving these exercises. If you get stuck or need help, I'm here to assist you! Happy coding!