About C + + reads variable amounts of input data

About C + + reads variable amounts of input data

#define _crt_secure_no_warnings 1#include <iostream>int main () {int sum = 0, value = 0;//reads data until the end of the file, computes the sum of all read-in values and WHI Le (std::cin >> value) sum + = value; Equivalent to Sumsum = sum + value std::cout << "sum is:" << sum << std::endl;system ("pause"); return 0;}

When an invalid character is entered or a file terminator is encountered, the loop ends.

Problem:

How do I enter a file terminator from the keyboard?

For Windows systems, enter the file terminator by Ctrl + Z, and then press ENTER.

Unix system, enter the file terminator method is CTRL + D

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About C + + reads variable amounts of input data