Compara dos numeros

// compilacion->     g++ -std=c++11 -o test test.cpp
#include <iostream>
using namespace std;
//----------------------------------------------------------------------
int ComparaNumeros(float a,float b){
    if ((a-b)==0) {return 0;}// 0 ,Igual ==
    if ((a-b)<0){return -1;}// -1 , a menor a b
    return (1);//               1  ,a es mayor que b
};
//----------------------------------------------------------------------
int main(){
    float a,b;
        while (1){//Bucle de test infinito ....

    cout <<endl;
    cout << "Primer num a=";cin >>a;
    cout << "Segundo num b=";cin >>b;

    switch (ComparaNumeros(a,b)){//Test de la funcion ComparaNumeros
        case 0: cout <<"Igual"<<endl;break;
        case 1 :cout <<"a > b"<<endl;break;
        default :cout <<"a < b"<<endl;break;
    }
}
    return 0;
};