#include <unistd.h>
#include <asm/io.h>

if(a==b) {}

#include <iostream>
#include <stdlib.h>
using namespace std;
int main(){
float a,b,c;
c=0;
cout<<"Vvedite 3na4enie peremennoi a \n";
cin>>a;
cout<<"Vvedite 3na4enie peremennoi b \n";
cin>>b;

if(a>b){
 cout<<"3na4enie a= "<<a <<"\n"; 
exit(0);
}
if (a==b){
cout<<0 <<"\n";
exit(0);
}
else{ cout<<"3na4enie b= "<<b << "\n";
exit(0);
}
}

...
if( a > b )
{
     int var = 1;
     cout << "1";
}
else if( a < b )
{
     int var = 2;
     cout << "2"; 
}
else if( a == b )
{
     int var = 3;
     cout << "3";
} 
else
    cout << "Fuck OFF";
...