How to break a loop for getting an integer array in c++

Question

How can I break a loop when I define an integer array with a number and I want to finish the loop by pressing the ENTER . I test '\\n' and '\\r' and '\\0' and char(13) and NULL but didn't work ! for example ( in this code i try to stop the loop with ascii code of ENTER ) :

#include <iostream>
using namespace std;
int main()
{
    int n[100];
    for (int i = 0; i < 100 && n[i]!=char(13); i++)
    {
        cin >> n[i];
    }
    return 0;
}

Answer 1

The behaviour of your code is undefined : you read an element from n before writing it: int n[100] = {}; is a fix for that.

Your specific problem here is that you need to check the error state of cin if an int is not readable from the stream: use something like std::cin.fail() .

Also, don't hardcode character values (presumably that's what char(13) is doing?), as then you're not writing portable code. Use '\\r' &c. instead.

Answer 2

您可以将代码n[i]!=char(13)更改为n[i-1]!=char(13) ，因为当您检查输入的值时，变量i已更改为i++ ，因此n[i]的值是未定义的，你将永远得到真实。