Question

#include<iostream>
using namespace std;

int main()
{
    char arr[200];
    while(1) {
        cin >> arr;
        int i = sizeof(arr);
        cout << "The arr input is "<< arr 
             << " and the size of the array is "<< i << endl;
    }
    return 0;
}

For the input of 34,
This code outputs :The arr input is 34 and the size of the array is 200

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while I want it to get the size of the used space of the array . So for The last input i want it to output :The arr input is 34 and the size of the array is 2

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Can someone tell me how?

Answer 1

Maybe you want strlen(arr) here. It must be null terminated, otherwise the cout << arr would not have worked.

You would need to #include <cstring>