C ++：存储用户输入

Question

I just want the user to enter some numbers. If the number is -1 the program stops and then outputs those same numbers. Why is that so difficult? I don't understand why the logic is not working here.

For example when the user types:

1 2 3 -1 

The program should then print out: 1 2 3 -1

#include <iostream>

using namespace std;

int main()
{
    int input, index=0;
    int array[200];

    do
    {
        cin >> input;
        array[index++]=input;
    } while(input>0);

    for(int i=0; i < index; i++)
    {
        cout << array[index] << endl;
    }
}

Answer 1

Change this

for(int i=0; i < index; i++)
{
    cout << array[index] << endl;
}

To

for(int i=0; i < index; i++)
{
    cout << array[i] << endl;
}

You used index at the seconde loop causing your program to print all the array cell's after the user input.

Also, if -1 is your condition you should change it to

} while(input>=0);
             ^^ 

Otherwise, also 0 will stop the loop, which is not what you asking for.