L27-2.cpp

    int first = 8;
    int second = 18;
    int *ptr = &second;
    *ptr = 9;
    cout  << first << " " << second << endl;    

    int first = 6;
    int *p = &first;
    int *q = p;
    (*q)++;
    cout << first  << endl;

    int first = 8;
    int *p = &first;
    cout << (*p)++ << " ";
    cout << first << endl;

    int *p = 0;
    int first = 110;
    *p = first;
    cout << *p << endl;

    int first = 8;
    int second = 11;
    int *third = &second; 
    first = *third;
    *third = *third + 2;
    cout  << first << "  " << second << endl;

    float f = 12.5;
    float p = 21.5;
    float* ptr = &f;
    (*ptr)++;
    *ptr = p;
    cout << *ptr << " " << f << " " << p << endl;
    

    int arr[5];
    int *ptr;
    cout << sizeof(arr) << " " << sizeof(ptr) << endl;

    int arr[] = {11, 21, 13, 14};
    cout << *(arr) << " " << *(arr+1) << endl;

    int arr[6] = {11, 12, 31};
    cout << arr << " " << &arr << endl;

    int arr[6] = {11, 21, 13};
    cout << (arr + 1) << endl;

    int arr[6] = {11, 21, 31};
    int *p = arr;
    cout << p[2] << endl;

    int arr[] = {11, 12, 13, 14, 15};
    cout << *(arr) << " " << *(arr + 3);

    int arr[] = {11, 21, 31, 41};
    int *ptr = arr++;
    cout << *ptr << endl;

     char ch = 'a';
    char* ptr = &ch;
    ch++;
    cout << *ptr << endl;


    char arr[] = "abcde";
    char *p = &arr[0];
    cout << p << endl;

    char arr[] = "abcde";
    char *p = &arr[0];
    p++;
    cout << p << endl;   

    char str[]= "babbar";
    char *p = str;
    cout << str[0] << " " << p[0] << endl;


    void update(int *p){
        *p = (*p)  *  2;
    }

    int main(){
        int i = 10;
        update(&i);
        cout << i << endl;
    }


    void fun(int arr[]) {
        cout << arr[0] << " ";
    }

    int main() {
        int arr[] = {11, 12, 13, 14};
        fun(arr + 1);
        cout << arr[0] << endl;
    }



    void update(int *p){
        int a = 70;
        p = &a;
        *p = (*p) * (*p);
    }

    int main(){
        int a = 70;
        square(&a);
        cout << a << endl;
    }


    int first = 10;
    int *p = &a;
    int **q = &p;
    int second = 20;
    *q = &second;
    (*p)++;
    cout << first << " " << second << endl;

    int first = 110;
    int *p = &first;
    int **q = &p;
    int second = (**q)++ + 9;
    cout << first << " " << second << endl; 


    int first = 100;
    int *p = &first;
    int **q = &p;
    int second = ++(**q);
    int *r = *q;
    ++(*r);
    cout << first << " " << second << endl; 

    void increment(int **p){
        ++(**p);
    }

    int main(){
        int num = 110;
        int *ptr = &num;
        increment(&ptr);
        cout << num << endl;
    }  



    int main()
    {
    int arr[] = {41, 52, 36, 74};
    int *p = (arr + 1);
    cout << *arr + 8;
    return 0;
    }


    int main()
    { 
        char *p; 
        char str[] = "pqrstuv";
        p = str;
        p += 3;
        cout << p;
        return 0;
    }


    int main()
    {
        char arr[20];
        int i;
        for(i = 0; i < 10; i++) {
            *(arr + i) = 65 + i;
        }
        *(arr + i) = '\0';
        cout << arr;
        return 0;
    }

    int main()
    {
        float arr[5] = {12.5, 10.0, 13.5, 90.5, 0.5};
        float *ptr1 = &arr[0];
        float *ptr2 = ptr1 + 3;
        cout<<*ptr2<<" ";
        cout<< ptr2 - ptr1;
        return 0;
    }


    int main() {
        char st[] = "ABCD";
        for(int i = 0; st[i] != ‘\0’; i++) {
            cout << st[i] << *(st)+i << *(i+st) << i[st];
        }
        return 0;
    }

    void Q(int z)
    {
        z += z;
        cout<<z << " ";
    }

    void P(int *y) 
    {
        int x = *y + 2;
        Q(x);
        *y = x - 1; 
        cout<<x << " ";
    }

    int main()
    {
        int x = 5;
        P(&x);
        cout<<x;
        return 0;
    }


    int main()
    {
        int ***r, **q, *p, i=8;
        p = &i;
        (*p)++;
        q = &p;
        (**q)++;
        r = &q;
        cout<<*p << " " <<**q << " "<<***r;
        return 0;
    }


    int f(int x, int *py, int **ppz) {
        int y, z;
        **ppz += 1;
        z = **ppz;
        *py += 2;
        y = *py;
        x += 3;
        return x + y + z;
    }

    int main() {
        int c, *b, **a;
        c = 4;
        b = &c;
        a = &b;
        cout << f(c, b, a);
        return 0;
    }