判断两个vector是否相等

来源于C++ Prime练习题4.8

#include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector<int> ivec1, ivec2;
    int ival;

    cout<<"Enter numbers for vector1(-1 to end): "<<endl;
    cin >> ival;
    while (ival != -1)
    {
        ivec1.push_back(ival);
        cin >> ival;
    }
    cout<<"Enter numbers for vector2(-1 to end): "<<endl;
    cin >> ival;
    while (ival != -1)
    {
        ivec2.push_back(ival);
        cin >> iva2;
    }

    if (ivec1.size() != ivec2.size())
        cout<<"Vector1 is not equal to vector2."<<endl;
    else if(ivec1.size() == 0)
        cout<<"Vector1 is equal to vector2"<<endl;
    else
    {
        vector<int>::iterator iter1, iter2;
        iter1 = ivec1.begin();
        iter2 = ivec2.begin();
        while (iter1 != ivec1.end() && iter2 != ivec2.end()
                && *iter1 == *iter2)
        {
            ++iter1;
            ++iter2;
        }
        if(iter1 == ivec1.end())
            cout<<"Vector1 is equal to vector2."<<endl;
        else
            cout<<"Vector1 is not equal to vector2."<<endl;
    }
    return 0;
}