C++ Reading an unknown number of integers to cin and outputting the sum

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The underlying problem here is that you don’t know in advance how many integers are going to come in, so you can’t use that for loop — there’s no sensible value for numbers.

Instead, keep reading values until the end of the input:

while (std::cin >> i)
    sum += i;

When the attempted read eventually fails, the while loop will exit.

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