C++ primer P94 练习3.20

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本文介绍了一个使用C++实现的简单程序，该程序读取一系列整数并将其存储在std::vector中。然后程序以两种方式显示这些整数的配对求和结果：相邻元素配对求和及首尾元素配对求和，并处理了元素数量为奇数的情况。

#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main(){
   vector<int> vec;
   int num;
   cout << "please input the numbers:" << endl;
   while (cin >> num){
      vec.push_back(num);
   }
   int length = vec.size();
   if (length == 0){
      cout << "there is no number!" << endl;
      return 0;
   }
   for (int j = 0; j < length - 1; j += 2){
      cout << vec[j] + vec[j + 1] << " "; 
   }
   cout << endl;
   if (length % 2 != 0){
      cout << "the last number " << vec[length - 1]<<" can't be added to other" << endl;
   }
   for (int j = 0; j < length / 2;j++){
      cout << vec[j] + vec[length - 1 - j] << " ";
   }
   cout << endl;
   if (length % 2 != 0){
      cout << "the mid number " << vec[length / 2] << " can't be added to other" << endl;
   }
   cout << endl;
   return 0;
}