Source code:

//program to overload <= operator

#include <iostream>
using namespace std;

class Fraction{
    private:
        int num;
        int den;
    public:
        Fraction(int n = 0, int d = 0){
            num = n;den = d;
        }
        //overloading operator with member function
        bool operator <=(Fraction f){
            //make conversion for data type
            float self = static_cast<float>(num)/den;
            float another = static_cast<float>(f.num)/f.den;
            if(self <= another){
                return true;
            }
            return false;
        }
        void display(){
            cout<<num<<"/"<<den<<endl;
        }
};


int main(){
    Fraction f1(1,2), f2(2,4), f3(1,5);
    if(f1 <= f2){
        cout<<"Fraction f1 is less than or equal to f2"<<endl;
    }
    if(f1 <= f3){
        cout<<"Fraction f1 is not less than or equal to f3"<<endl;
    }
    return 0;
}

Sample run:

Fraction f1 is less than or equal to f2