Answer 1

if-else is how you would start a conditional check, to check if a certain expression is true, and if not, it'll run the else code.

else-if is what is chained on to if-elses to extend them in such a way where for example a user can enter multiple valid inputs. These inputs could be strings for example, as they are not compatible with switch statements, which is the prefered method compared to chained if-elses.

string str = "Cool";

if (str == "Hi")
cout << "str is Hi";
else if (str == "Hello")
cout << "str is Hello";
else if (str == "Cool")
cout << "str is Cool";
else
cout << "Unknown string";

//output is "str is Cool".