Answer to Question #267974 in C++ for malika

Question

This program is supposed to write 100 99 98 3 2 1, but it probably does not. What is the program doing that is incorrect? (We're not asking you explain why the incorrect action leads to the particular outcome it does, and we're not asking you to propose a fix to the problem.)
    #include <iostream>
    using namespace std;
    int* nochange(int* p)
    {return p;
    }
    int* getPtrToArray(int& m)
    {
        int anArray[100];
        for (int j = 0; j < 100; j++)
            anArray[j] = 100-j;
        m = 100;
        return nochange(anArray); }
    void f()
    {int junk[100];
        for (int k = 0; k < 100; k++)
            junk[k] = 123400000 + k;
        junk[50]++;
    }
    int main()
    { int n;
        int* ptr = getPtrToArray(n);
        f();
        for (int i = 0; i < 3; i++)
            cout << ptr[i] << ' ';
        for (int i = n-3; i < n; i++)
            cout << ptr[i] << ' ';
        cout << endl;}

Answer 1

 /*This program is supposed to write 100 99 98 3 2 1,
 but it probably does not.
 What is the program doing that is incorrect?
(We're not asking you explain why the incorrect action leads to the particular outcome it does,
and we're not asking you to propose a fix to the problem.)*/
 #include <iostream>
    using namespace std;
    int* nochange(int* p)
    {return p;
    }
    int* getPtrToArray(int& m)
    {
        int anArray[100];
        for (int j = 1; j < 100; j++)
            anArray[j] = 100-j;
        m = 100;
        return nochange(anArray); }
    void f()
    {int junk[100];
        for (int k =0;k < 100; k++)


            junk[k] = 100-k;
        junk[50]++;
    }
    int main()
    { int n;
        int *ptr = getPtrToArray(n);
      f();
        for (int i = 0; i <3; i++)
            cout << ptr[i] << ' ';
        for (int i = n-3; i < n; i++)
            cout << ptr[i] << ' ';
        cout << endl;}