Question

C++ Array Expander and Element Shifter

Thank you so much to anybody that can help! Here are our two homework prompts:

PART A: Array Expander

Write a function that accepts an int array and the array’s size as arguments. The function should create a new array that is twice the size of the argument array. The function should copy the contents of the argument array to the new array and initialize the unused elements of the second array with 0. The function should return a pointer to the new array. Take your input data from the file Gradelist.txt. Your program should:  Display your name.  Display the original array;  Display the size of the original array;  Display the new array that your function generates;  Display the size of the new array.

PART B: Element Shifter

Write a function that accepts an int array and the array’s size as arguments. The function should create a new array that is one element larger than the argument array. The first element of the new array should be set to 0. Element 0 of the argument array should be copied to element 1 of the new array, element 1 of the argument array should be copied to element 2 of the new array, and so forth. The function should return a pointer to the new array. Take your input data from the file Gradelist.txt. Your program should display:  Display your name.  Display the original array;  Display the size of the original array;  Display the new array that your function generates;  Display the size of the new array. Call your program: YourName-Hwrk09B.cpp

Answer 1

// A : Array Expander
// function that expands the input array to twice its size and returns the pointer to the new array
// The function should create a new array that is twice the size of the argument array.
// The function should copy the contents of the argument array to the new array and initialize the unused elements of the second array with 0.
// The function should return a pointer to the new array.
int* array_expander(int arr[], int size)
{
   int *new_arr = new int[2*size];
   for(int i=0;i<size;i++)
       new_arr[i] = arr[i];
   for(int i=size;i<2*size;i++)
       new_arr[i] = 0;
   return new_arr;
}

// B: Element Shifter
// function that expands the input array to 1 more than its size and returns the pointer to the new array
// The function should create a new array that is one element larger than the argument array.
// The first element of the new array should be set to 0.
// Element 0 of the argument array should be copied to element 1 of the new array,
// element 1 of the argument array should be copied to element 2 of the new array, and so forth.
// The function should return a pointer to the new array.
int *array_shifter(int arr[], int size)
{
   int *new_arr = new int[size+1];
   new_arr[0] = 0;
   for(int i=0;i<size;i++)
       new_arr[i+1] = arr[i];
   return new_arr;
}