Answer to Question #267534 in C++ for malika

Question

This program is supposed to write 30 20 10, one per line. Find all of the bugs and show a fixed version of the program:

    int main()
    {
        int arr[3] = { 5, 10, 15 };
        int* ptr = arr;

        *ptr = 30;          // set arr[0] to 30
        *ptr + 1 = 20;      // set arr[1] to 20
        ptr += 2;
        ptr[0] = 10;        // set arr[2] to 10

        while (ptr >= arr)
        {
            ptr--;
            cout << *ptr << endl;    // print values
        }
    }

Answer 1

#include <iostream>


using namespace std;


 int main()
{
    int arr[3] = { 5, 10, 15 };
    int* ptr = arr;


    *ptr = 10;          // set arr[0] to 10
    *++ptr = 20;      // set arr[1] to 20
    ptr += 2;
    ptr[-1] = 30;        // set arr[2] to 30


    while (ptr > arr)
    {
        ptr--;
        cout << ' ' << *ptr;    // print values
    }
    cout << endl;
}