Definition and Uses

Pulling together all the code fragments from the previous section, the whole program looks like this:

void ShowTime ()

{

ShowText ( "The System Time is:" );

int iTime = GetUTCTime ();

// integer values will be converted

// to strings automatically

string sHour = GetUTCHour ( iTime );

string sMinute = GetUTCMinute ( iTime );

ShowText ( sHour + ":" + sMinute );

}

void ShowTimeThreeTimes ()

{

ShowTime ();

ShowTime ();

ShowTime ();

}

void Scene1 ()

{

ShowTimeThreeTimes ();

}

This program contains three function definitions: ShowTime, ShowTimeThreeTimes and Scene1.

Inside the definition of Scene1, there is a statement that uses or calls ShowTimeThreeTimes. Similarly, ShowTimeThreeTimes calls ShowTime three times. Notice that the definition of each function appears above the place where it is used.

This is necessary in C++; the definition of a function must appear before (above) the first use of the function. You could try running this program with the functions in a different order and see what error messages you get.