test 2.1-4

题目说的两个n位的二进制相加，结果保留到第三个n+1位的二进制里，我假设n=5,把原来两个二进制用line1【5】,line2【5】来表示，数组中每个元素只能是0或者1，程序如下

#include<iostream>

#include<vector>

using namespace std;

int main()

{
vector<int> line; int target;
cout << "Enter your target number :"; cin >> target; 
cout << "Enter your sequence(alpha to quit) :";
int temp;
while (cin >> temp)
line.push_back(temp);
int n = line.size(); 
bool mark = false;
for (int i = 0; i < n; i++)
{
if (line[i] == target)
{
cout << i + 1; mark = true;
}
}
if (!mark)
cout << "target=NIL ";
return 0;

}