need some help with this cpp challenge question

Question

the code snippet goes like this:

float f = 0.1;
if ( f == 0.1 )
cout<<"True";
else
cout<<"False";

it really confused me when i was told that the output is:
False

i cross checked it with another compiler, only to get the same result. any suggestions welcome. thanks.

Answer 1

#include <iostream>
#include <typeinfo>
using namespace std;

int main() {

float f = 0.1;

cout << typeid(f).name() << endl;
cout << typeid(0.1).name() << endl;
return 0;
}

Answer 2

float f = 0.1 is double type value but since it is assigned to a float type variable, there is loss in precision but any floating point number by default is a double.

So f is a float now and 0.1 is a double so they are not equal because as you have guessed by now, there is a change in precision.