STL algorithm find() demo

#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
vector<int> ivec = { 1, 2, 10, 3, 4, 5 };
int target = 10;
auto result = find(ivec.begin(), ivec.end(), target);
if (result != ivec.end())
cout << "found at index " << result - ivec.begin() << endl;
else
cout << "not found" << endl;
return 0;
}