C/C++ C++: Replacing Characters in A String

[ineedhelpnow]

Replace any space ' ' by '_' in 2-character string passCode.

Sample program:

#include 
#include 
#include 
using namespace std;

int main() {
   string passCode;

   passCode = "1 ";
   
<student code>

   

   cout << passCode << endl;
   return 0;
}

I'm super lost on this. I could definitely use some help/hints. Thanks.

 

[Evgeny.Makarov]

Check if the 0th character is a space. If so, assign [m]'_'[/m] to it. Do the same with the 1st character.