Answer 1

But a much easier way is this:

https://code.sololearn.com/cO69aIIUB3BC/?ref=app

Answer 2

You can use an Enum for that:

#include <iostream>
using namespace std;

enum Planets {
mercury,
venus,
earth,
mars
};

int main ()
{
Planets planet = mercury;

if(planet == mercury)
{
cout << " true";
}

return 0;
}

Answer 3

An enum is nummerated, so you must input 0 for marcury 1 for venus 2 for earth...

if you want to Input the whole word you can use a String or make a case statement to convert string to the enum.

Answer 4

Your input has to be stored in a variable:

#include <iostream>
using namespace std;

enum Planets {
mercury,
venus,
earth,
mars
};

int main ()
{
Planets planet;
cin >> planet; //Write 0 in Input box
if(planet == mercury)
{
cout << "your Input was
mercury";
}

return 0;
}

Answer 5

Sorry, i overlook, that you cant input an enum.
so it should work:

#include <iostream>
using namespace std;

enum Planets {
mercury,
venus,
earth,
mars
};

int main()
{
int input;
Planets planet;
cin >> input;

switch(input)
{
case 0:
planet = mercury;
break;
case 1:
planet = venus;
break;
case 2:
planet = earth;
break;
case 3:
planet = mars;
break;
}

if (planet == mercury)
{
cout << "Planet is mercury!";
}

return 0;
}