Errors in class

[GriffinReborn]

I am almost done with a project but I keep getting these errors when I compile. They occur in both of my classes and this is a barrier that is keeping me from finishing. I would like to understand what I am doing wrong and would be grateful for the help. As you can tell, I am a beginner.

#include <iostream>  // simplification of code
#include <string>
using namespace std;

class std::A
{ //error: qualified name does not name a class before '{' token
    A();
};

class B: public std::A
{         //error:expected class-name before '{' token
    B();
};


int main()
{
    // some code written
    return 0;
}
//hundreds of code written 

[dmpaul26]

Why are you using class std::A Why not just try class A That's the only thing that really stands out to me.