pointer QuizZ

1. ============================
#include <iostream>
using namespace std;

int main()
{
    int a = 32, *ptr = &a;
    char ch = 'A', &cho = ch;

    cho += a;
    *ptr += ch;
    cout << a << ", " << ch << endl;
    return 0;
}
Options:
a. 32, A
b. 32, a
c. 129, a
d. 129, A

2.============================
#include <iostream>
using namespace std;

int main()
{
    const int i = 20;
    const int* const ptr = &i;
    (*ptr)++;
    int j = 15;
    ptr = &j;
    cout << i;
    return 0;
}
Options:
a. 20
b. 21
c. 15
d. Compile error

3. ============================
#include <iostream>
using namespace std;
int main()
{
    int num[5];
    int* p;
    p = num;
    *p = 10;
    p++;
    *p = 20;
    p = &num[2];
    *p = 30;
    p = num + 3;
    *p = 40;
    p = num;
    *(p + 4) = 50;
    for (int i = 0; i < 5; i++)
        cout << num[i] << ", ";
    return 0;
}
Options:
a. 10, 20, 30, 40, 50
b. 10, 20, 30, 40, 50,
c. compile error
d. runtime error

4. ============================

#include <iostream>
using namespace std;
int main()
{
    int arr[] = { 4, 5, 6, 7 };
    int* p = (arr + 1);
    cout << *arr + 10;
    return 0;
}
Options:
a. 12
b. 15
c. 14
d. error

5. ===========================

#include <iostream>
using namespace std;
int main()
{
    int a = 10, *pa, &ra;
    pa = &a;
    ra = a;
    cout << "a=" << ra;
    return 0;
}
Options:
a. 10
b. no output
c. compile error
d. runtime error