c

1.
#include <stdio.h>
int main() {
    int a = 5;
    int *p = &a;
    printf("%d %d", *p, p);
}

2.
#include <stdio.h>
int main() {
    int arr[] = {10, 20, 30};
    int *p = arr;
    printf("%d", *(p + 2));
}

3.
#include <stdio.h>
int main() {
    int a = 10;
    int *p = &a;
    *p += 5;
    printf("%d", a);
}

4.
#include <stdio.h>
int main() {
    int a = 5, b = 10;
    int *p = &a;
    p = &b;
    *p = 20;
    printf("%d %d", a, b);
}

5.
#include <stdio.h>
int main() {
    int arr[] = {1, 2, 3};
    int *p = arr;
    printf("%d", *p++);
}

6.
#include <stdio.h>
int main() {
    int arr[] = {1, 2, 3};
    int *p = arr;
    printf("%d", (*p)++);
}

7.
#include <stdio.h>
int main() {
    int x = 8;
    int *p = &x;
    printf("%d", *p++); 
}

8.
#include <stdio.h>
int main() {
    int arr[] = {10, 20, 30};
    int *p = arr;
    printf("%d", *++p);
}

9.
#include <stdio.h>
int main() {
    int arr[] = {10, 20, 30};
    int *p = arr;
    printf("%d", ++*p);
}

10.
#include <stdio.h>
int main() {
    int arr[] = {5, 10, 15};
    int *p = arr;
    printf("%d", *p + 1);
}

11.
#include <stdio.h>
int main() {
    char str[] = "HELLO";
    char *p = str;
    printf("%c", *(p + 3));
}

12.
#include <stdio.h>
int main() {
    char *p = "WORLD";
    printf("%c", *(p + 1));
}

13.
#include <stdio.h>
int main() {
    int arr[] = {1,2,3,4};
    int *p = arr;
    printf("%d", p[2]);
}

14.
#include <stdio.h>
int main() {
    int arr[] = {1,2,3};
    int *p = arr;
    printf("%d", *(p + (*p)));
}

15.
#include <stdio.h>
int main() {
    int x = 5;
    int *p = &x;
    int **q = &p;
    printf("%d", **q);
}

16.
#include <stdio.h>
int main() {
    int x = 10;
    int *p = &x;
    int **q = &p;
    **q += 5;
    printf("%d", x);
}

17.
#include <stdio.h>
int main() {
    int arr[] = {10, 20, 30};
    int *p = arr + 1;
    printf("%d", *(p - 1));
}

18.
#include <stdio.h>
int main() {
    int arr[] = {5, 10, 15};
    int *p = arr;
    printf("%d", *(p + 1) + *(p + 2));
}

19.
#include <stdio.h>
int main() {
    int a = 5;
    int *p = &a;
    int *q = p;
    *q = 10;
    printf("%d", a);
}

20.
#include <stdio.h>
int main() {
    int arr[] = {1,2,3};
    int *p = arr;
    p += 2;
    printf("%d", *p);
}