Lab #10. Array processing in function

Lab #10.1. Sum of array elements in range

Create and test function array_sum() with 3 parameters: arr (array of integers), num1 (index of first element), num2 (index of the last element) to calculate sum of elements num1..num2 (lab10.1.cpp).

#include <iostream>

using namespace std;

int array_sum

// ADD CODE HERE

};

int main()

{

int arr[] = {1,2,5,7,3,6};

cout << array_sum(arr,1,3) << endl;

return 0;

}

/*

Expected output:

14

*/

A correct solution: lab10.1a.cpp.

Lab #10.2. Copying the contents of an array to another array

Create and test function array_copy() with 3 parameters: arr_dest (destination array), arr_src (source array), num (number of elements), which copies first num elements, from arr_src to arr_dest (lab10.2.cpp). The destination array already exists in memory.

#include <iostream>

using namespace std;

void array_copy

// ADD CODE HERE

};

int main()

{

int arr1[] = {1,2,3,4,5,6};

int arr2[] = {11,22,33,44,55,66};

array_copy (arr1, arr2, 4);

for (int i=0; i<6; i++) cout << arr1[i] << endl;

return 0;

}

/*

Expected output:

11

22

33

44

5

6

*/

A correct solution: lab10.2a.cpp.

Lab #10.3. Creating a dynamic array

Create function arr_create() with 2 parameters: arr (array), num (size), which creates new dynamic array arr of size num (lab10.3.cpp).

#include <iostream>

using namespace std;

void array_create

// ADD CODE HERE

};

int main()

{

int num = 6;

int *arr;

array_create (arr, num);

for (int i=0; i<num; i++) arr[i] = (i+1)*10+i+1;

for (int i=0; i<num; i++) cout << arr[i] << endl;

delete[] arr;

return 0;

}

/*

Expected output:

11

22

33

44

55

66

*/

A correct solution: lab10.3a.cpp.

Lab #10.4. Modification of the previous function of creating a dynamic array

Modify function arr_create() to return created array via return instead of parameter (function will have only one parameter num) (lab10.4.cpp).

#include <iostream>

using namespace std;

int *array_create

// ADD CODE HERE

};

int main()

{

int num = 6;

int *arr;

arr = array_create (num);

for (int i=0; i<num; i++) arr[i] = (i+1)*10+i+1;

for (int i=0; i<num; i++) cout << arr[i] << endl;

delete[] arr;

return 0;

}

/*

Expected output:

11

22

33

44

55

66

*/

A correct solution: lab10.4a.cpp.

Lab #10.5. Resizing dynamic array

Create function arr_recreate() with 3 parameters: arr (array), num (new size), num0 (previous size), which resizes the array to num, preserving all values possible, returning new array through parameters arr. With this function, array can be either increased or decreased in size (lab10.5.cpp).

Suggested scheme of solution: create another array of size num, copy all possible values to it, and delete the old array replacing it by the new array.

#include <iostream>

using namespace std;

void array_recreate

// ADD CODE HERE

};

int main()

{

int num = 4;

int *arr;

array_recreate (arr, num, 0);

for (int i=0; i<num; i++) arr[i] = (i+1)*10+i+1;

for (int i=0; i<num; i++) cout << arr[i] << endl;

cout << endl;

num = 6;

array_recreate (arr, num, 4);

arr[4] = 100;

arr[5] = 101;

for (int i=0; i<num; i++) cout << arr[i] << endl;

array_recreate (arr, 0, num);

return 0;

}

/*

Expected output:

11

22

33

44

11

22

33

44

100

101

*/

A correct solution: lab10.5a.cpp.