no match for 'operater==' in 'std::cin == "(letter)"

[PieDude137]

I'm very new to C++ (2 days), and I'm trying to write a simple calculater program.

But each time i try to run it I get this error message on each of my if statements: no match for 'operater==' in 'std::cin == "(letter)"

Here's the code:

#include <iostream>

using namespace std;

int main()
{cout <<"Please press, \nm for multiplication, \nd for division, \ns for sutraction or \na for addition \n";

//Mutiplication
  if (cin == "m") {

    double thisisanumber2;
    double thisisanumber;
    double thisisanumber3;

    cout<<"Please enter a number ";
    cin>> thisisanumber;
    cin.ignore();
        cout<<"Please enter another number ";
    cin>> thisisanumber2;
    cin.ignore();

    thisisanumber3 = thisisanumber * thisisanumber2;

    cout<<""<< thisisanumber <<" Times "<< thisisanumber2 <<" Is "<< thisisanumber3 <<"\n";
    cin.get();}

//Division
if (cin == "d"){

     double thisisanumber2;
    double thisisanumber;
    double thisisanumber3;

    cout<<"Please enter a number ";
    cin>> thisisanumber;
    cin.ignore();
        cout<<"Please enter another number ";
    cin>> thisisanumber2;
    cin.ignore();

    thisisanumber3 = thisisanumber / thisisanumber2;

    cout<<""<< thisisanumber <<" Divided by "<< thisisanumber2 <<" Is "<< thisisanumber3 <<"\n";
    cin.get();}

//Subtraction
if(cin == "s"){

double thisisanumber2;
    double thisisanumber;
    double thisisanumber3;

    cout<<"Please enter a number ";
    cin>> thisisanumber;
    cin.ignore();
        cout<<"Please enter another number ";
    cin>> thisisanumber2;
    cin.ignore();

    thisisanumber3 = thisisanumber - thisisanumber2;

    cout<<""<< thisisanumber <<" Minus "<< thisisanumber2 <<" Is "<< thisisanumber3 <<"\n";
    cin.get();}

//Addition
if(cin == "a"){
  double thisisanumber2;
    double thisisanumber;
    double thisisanumber3;

    cout<<"Please enter a number ";
    cin>> thisisanumber;
    cin.ignore();
        cout<<"Please enter another number ";
    cin>> thisisanumber2;
    cin.ignore();

    thisisanumber3 = thisisanumber + thisisanumber2;

    cout<<""<< thisisanumber <<" Plus "<< thisisanumber2 <<" Is "<< thisisanumber3 <<"\n";
    cin.get();}

}

Very sorry if it's a simple error, but i'm a complete noob at C++.

Thanking you in advance.

[Moschops]

cin == "a"

You are attempting to compare the object cin with the object

"a"

cin is an object of type istream.

"a" is a string literal.

It makes no sense whatsoever to compare an object of type istream with a string literal, and unsurprisingly the compiler has no idea what to do with it.

You're using cin wrongly. Use cin to get something from the keyboard, like this:

string userInput;
cin >> userInput;

and then compare the string object userInput with things.

[PieDude137]

Thanks, it's so obvious now you mention it!
The program works fine now.

Thanks again.