How to create a third from two arrays, in c (by adding two arrays). Please explain how it is formed?

Question

C++ / C#

#define _CRT_SECURE_NO_WARNINGS
#define _CRT_NONSTDC_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
int main()
{
    setlocale(LC_ALL, "");
    int A[5], B[6], C[11];
    int* d, * w, * e;
    int i, j, max;
    d = A;
    w = B;
    e = C;
    srand(time(NULL));
      for (i = 0; i < 5; i++)
      {
        d[i] = 10 + rand() % 90;
        C[i] = d;
        printf("массив:%d\n", d[i]);
      }
    for (i = 5; i < 6; i++)
    {
        w[i] = 10 + rand() % 90;
        C[i] = w;
        printf("массив 2:%d\n", w[i]);
        for (i =5;i <11;i ++)
               C[i]=
}