Задание 1:

#include <iostream>

using namespace std;

int trunc1(double* a)

{

return ((int)*a);

}

int main() {

double a, b, sum;

double *pa = &a, *pb = &b;

cout << "a: ";

cin >> *pa;

cout << "b: ";

cin >> *pb;

sum = *pa + *pb;

cout << "summ: " << sum << endl;

cout << "(int)sum: " << trunc1(&sum);

return 0;

}

Задание 2:

#include <iostream>

using namespace std;

int num_of_duplicate_items(int *a, int *b, int length)

{

int res = 0;

for (int i = 0; i < length; i++, a++)

{

 for (int j = 0; j < length; j++)

 {

  if (*a == *b) res++;

  b++;

 }

 b -= length;

}

return res;

}

int main() {

int a[5], b[5];

cout << "Array a: ";

for (int i = 0; i < 5; i++)

 cin >> a[i];

cout << "Array b: ";

for (int i = 0; i < 5; i++)

 cin >> b[i];

cout << "Number of duplicate items: " << num_of_duplicate_items(a,b,5);

return 0;

}