Code to test the problem above about 10 million times.

float_check_b.cc

#include <iostream>

#include <math.h>
#include <float.h>

using namespace std;

inline bool isNearlyEqual(float val_a, float val_b) {
  return fabs(val_a - val_b) < FLT_EPSILON;
}

int main() {
    int ITERATIONS = 10000000;
    int counter = 0;

    for (int i = 0; i < ITERATIONS; ++i) {
        
        float a = 0.151f + 0.151f;
        float b = 0.101f + 0.201f;
        bool d = isNearlyEqual(a, b);
        if (d) {
            counter++;
        }
    }
         
    std::cout << "Counter = " << counter << "\n";
    return 0;
}