问c++入门第3章练习3.20矢量溢出

EN

for (int sum; v1 < ivec.size();++v1){  //executes for statement as long as v1 < ivec.size() is true.
    sum = ivec[v1] + ivec[v1 + 1]; // same as sum = ivec[0] + ivec[1].
    cout << sum << endl; sum = 0; // prints the result of sum = ivec[v1] + ivec[v1 + 1].

#include "stdafx.h"
#include <iostream>
#include <vector>

using namespace std;

int main(){
vector<int> ivec;
decltype (ivec.size()) v1 = 0;
unsigned int i1 = 0;

while (cin >> i1){ ivec.push_back(i1);} // receive input and stores into ivec.

for (int sum; v1 < ivec.size();++v1){  //executes for statement as long as v1 < ivec.size() is true.
    sum = ivec[v1] + ivec[v1 + 1]; // same as sum = ivec[0] + ivec[1], v1 is now = 1.
    cout << sum << endl; sum = 0; // prints the result of sum = ivec[v1] + ivec[v1 + 1].
}

system("pause");
return 0;
}