عبارت شرطی if در ++C

if(y != 0)
 cout << x << " / " << y << " = " << x / y << endl;
else
 cout << x << " / " << y << " = undefined!" << endl;

if(i > 0){
 cout << i << " is positive!" << endl;
 cout << "What a great discovery!";
 }
 else if(i == 0){
 cout << i << " is equal to zero!" << endl;
 cout << "we make it positive!" << endl;
 ++i;
 }
 else{
 cout << i << " is negative!" << endl;
 cout << "I don't know what to write here!";
 }

if(i == 0)
 cout << "i is equal to zero!";
 else
 cout << "i is not zero!";
 
 /*the above code simply could be written in a single line*/
 (i == 0) ? cout << "i is equal to zero!": cout << "i is not zero!";