How to use map::end from map::find in C++

I want to use the C++ map function, map::find, to determine if a specific string is within a map. I know that find returns map::end but I am not sure on how to use it. So if the same string exists in both names_ and info_, I want it to print that string to the screen.

In my header:

std::vector<std::string>names_;
std::map<std::string, unsigned int> info_;

In the .cpp (THIS CODE IS WRONG):

for(unsigned int i=0;i<names_.size();i++){
    std::map<std::string, unsigned int>::iterator it;
    it = info_.find(names_[i]);
    if info_.find(names_[i]开发者_开发问答) != info_.end()
        std::cout << names_[i] << std::endl; 
}

What I am doing wrong in the .cpp code snipet? I know it is something with iterators.

---

It should be:

for(unsigned int i=0;i<names_.size();i++){
    if (info_.find(names_[i]) != info_.end())
        std::cout << names_[i] << std::endl; 
}

---

Apart from anything else:

if info_.find(names_[i]) != info_.end()

should be:

if ( info_.find(names_[i]) != info_.end() )

In C++ (and C) conditions tested by ifs and whiles must be enclosed in parens.

---

After the obvious fix of enclosing the if expression if brackets mentioned in the other answers, the code works.

#include <iostream>
#include <map>
#include <vector>

int main() {
  std::vector<std::string>names_;
  std::map<std::string, unsigned int> info_;
  names_.push_back("a");
  names_.push_back("b");
  names_.push_back("c");
  info_["a"] = 123;
  info_["c"] = 123;
  info_["d"] = 456;
  for(unsigned int i=0;i<names_.size();i++){
      std::map<std::string, unsigned int>::iterator it;
      if (info_.find(names_[i]) != info_.end())
          std::cout << names_[i] << std::endl;
  }
}

Output:

a
c

Isn't that what you asked for?