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Reexamine the version of the analyze_trades program shown in
Segment 556. To convert that program into one that does
periodic updates, you need only to put the reading and displaying
statements in a special kind of while statement. To repeat a series
of statements ad infinitum, you can insert them into a
while loop in which the Boolean expression consists of just the
number 1. Because 1 is not 0, the while loop
will carry on until you type the control-c keychord—or the
appropriate alternative recognized by your operating system:
while (1) {
...
}