使用ubuntu linux在c ++中进行文件重定向和编码的问题

Question

I am trying to complete an assignment where I create a numbers.txt file that has one line with six numbers without any addition or subtraction. I have to write a program(sum.cpp) that adds the numbers using cin as an input. I have instructions to go to linux and type in $./sum < numbers.txt and it should print sum.

I tried doing that and multiple variations of the code and got a blank screen. When I did it in another compiler I got 32764 which is way off from the sum.

#include <iostream>
using namespace std;
int main()
{
  int sum = 0;
  int input= 0;
  while(cin>>input)
       {
         sum+=input;
       }

  cout << sum << endl;
  return 0;
}

Expected Results :

If you have a file numbers.txt that contains:

10 15 16 -7 102 345

then if you redirect it into the program, it should report:

$ ./sum < numbers.txt
481 

Answer 1

将sum.cpp和numbers.txt放在同一目录中后，请尝试运行以下命令

g++ sum.cpp -o sum.out

chmod +x ./sum.out

./sum.out < numbers.txt