如何使用 If 和 else 语句在向量中搜索

Question

I have an issue with searching in a vector. Let's say I have a vector, the idea is to use if and else statements to check each element and then print out a string message. So for example if there is a 1 at 0 then it should print out a message. The example below shows what I am trying to explain. If there is 1 at 0 then print out a message.

vector<int> myvec {1,2,3,4,5};

if (statement) {
  cout << "The number 1 is at 0";
}

At the moment I have tried this:

vector<int> myvec {1,2,3,4,5};

if (find(myvec.begin(), myvec.end(), 3) != myvec.end()) {
  cout << "yes it is there" << endl;
}

This only checks to see if 3 is in the vector but I want to find out if 1 is at 0.

Answer 1

You're trying too hard, simply

if (myvec[0] == 1)

For extra security you could add a check that the vector is not empty

if (!myvec.empty() && myvec[0] == 1)