Lecture26.cpp

#include<iostream>
using namespace std;

void update(int *p) {

   // p = p + 1;
   //cout << "inside "<< p <<endl;
   *p = *p + 1;

}

void print(int *p) {

    cout << *p << endl; 

}

int getSum(int *arr, int n) {

    cout << endl << "Size : " << sizeof(arr) << endl;

    int sum = 0;
    for(int i=0;i<n;i++) {
        sum += arr[i];
    }
    return sum;
}

int main () {

//                                          array pointer 

//int arr[10] = {23, 122, 41, 67};


// cout <<" address of first memory block is " << arr << endl;
// cout << arr[0] << endl;
// cout <<" address of first memory block is " << &arr[0] << endl;
// cout << "4th " << *arr << endl;
// cout << "5th " << *arr + 1 << endl;
// cout << "6th " << *(arr + 1) << endl;
// cout << "7th " << *(arr) + 1 << endl;
// cout << "8th " << arr[2] << endl;
// cout << "9th " << *(arr+2) << endl;
// int i = 3;
// cout << i[arr] << endl;
int temp[10] = {1,2};
cout << sizeof(temp) << endl;
cout << " 1st " <<  sizeof(*temp) << endl;
cout << " 2nd " <<  sizeof(&temp) << endl;

// int *ptr = &temp[0];
// cout << sizeof(ptr) << endl ;
// cout << sizeof(*ptr) << endl ;
// cout << sizeof(&ptr) << endl ;



// int a[20] = {1,2,3,5};
// //cout << " ->" << &a[0] << endl;
// // cout << &a << endl;
// //cout << a << endl;
// int *p = &a[0];
// //cout << p << endl;
// //cout << *p << endl;
// cout << "-> " << &p << endl;
// */

//    int arr[10];

// //ERROR
//    //arr = arr+1;

//     int *ptr = &arr[0];
//     cout << ptr << endl;
//     ptr = ptr + 1;
//     cout << ptr << endl;

// //                                               character pointer 

//     int arr[5] = {1,2,3,4,5};
//     char ch[6] = "abcde";


//     cout << arr << endl;
//     //attention here
//     cout << ch << endl;
    
//     char *c = &ch[0];
//     //prints entire string
//     cout << c << endl;

//     char temp = 'z';
//     char *p = &temp;

//     cout << p << endl;

// //                                              function pointer 

// /*
//     int value = 5;
//     int *p = &value;

//     //print(p);
//     cout <<" Before " << *p << endl;
//     update(p);
//     cout <<" After " << *p << endl;
//     */

//     int arr[6] = {1,2,3,4,5,8};

//     cout << "Sum is " << getSum(arr+3 ,3) << endl ;  

    return 0;
}