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C++ Exercises: Compute the sum of the two given arrays of integers, length 3 and find the array which has the largest sum

C++ Basic Algorithm: Exercise-93 with Solution

Write a C++ program to compute the sum of the two given arrays of integers, length 3 and find the array which has the largest sum.

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;

static int *test(int nums1[], int nums2[])
          {
              return nums1[0] + nums1[1] + nums1[2] >= nums2[0] + nums2[1] + nums2[2] ? nums1 : nums2;
          } 

int main () {
   int *p;
   int nums1[] = { 1, 5, 7 };	
   int nums2[] = { 1, 5, 3 };
   int arr_length = sizeof(nums1) / sizeof(nums1[0]);
   p =  test(nums1, nums2);
   cout << "\nNew array: " << endl;
   for ( int i = 0; i < arr_length; i++ ) {
      cout << *(p + i) << " ";
   } 
   return 0;
}

Sample Output:

New array:
1 5 7

Pictorial Presentation:

C++ Basic Algorithm Exercises: Compute the sum of the two given arrays of integers, length 3 and find the array which has the largest sum.

Flowchart:

Flowchart: Compute the sum of the two given arrays of integers, length 3 and find the array which has the largest sum.

C++ Code Editor:

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Previous: Write a C++ program to check a given array of integers, length 3 and create a new array. If there is a 5 in the given array immediately followed by a 7 then set 7 to 1.
Next: Write a C++ program to create an array taking two middle elements from a given array of integers of length even.

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C++ Programming: Tips of the Day

What is the usefulness of `enable_shared_from_this?

It enables you to get a valid shared_ptr instance to this, when all you have is this. Without it, you would have no way of getting a shared_ptr to this, unless you already had one as a member. 

class Y: public enable_shared_from_this
{
public:

    shared_ptr f()
    {
        return shared_from_this();
    }
}

int main()
{
    shared_ptr p(new Y);
    shared_ptr q = p->f();
    assert(p == q);
    assert(!(p < q || q < p)); // p and q must share ownership
}

The method f() returns a valid shared_ptr, even though it had no member instance. Note that you cannot simply do this:

class Y: public enable_shared_from_this
{
public:

    shared_ptr f()
    {
        return shared_ptr(this);
    }
}

The shared pointer that this returned will have a different reference count from the "proper" one, and one of them will end up losing and holding a dangling reference when the object is deleted.

Ref : https://bit.ly/3pwVzzz